RHSA-2026:40762
Vulnerability from csaf_redhat - Published: 2026-07-22 12:55 - Updated: 2026-07-23 13:23Summary
Red Hat Security Advisory: OpenShift Container Platform 4.19.39 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.19.39 is now available with updates to packages and images that fix several bugs and add enhancements.
This release includes a security update for Red Hat OpenShift Container Platform 4.19.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.
This advisory contains the container images for Red Hat OpenShift Container Platform 4.19.39. See the following advisory for the RPM packages for this release:
https://access.redhat.com/errata/RHBA-2026:40761
Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:
https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/
Security Fix(es):
* dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)
* dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)
* dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)
* gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability (CVE-2026-42009)
* gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010)
* dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)
* gnutls: gnutls: Information disclosure via heap overread in RSA key exchange (CVE-2026-5260)
* glibc: glibc: Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width (CVE-2026-5450)
* gnutls: gnutls: Security bypass due to incorrect name constraint handling (CVE-2026-42011)
* gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name (CVE-2026-42013)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
All OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap can cause an infinite loop, making dnsmasq unresponsive to all queries.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A heap out-of-bounds read vulnerability was discovered in dnsmasq's DNSSEC validation. When processing RRSIG records, dnsmasq calculates the signature length by subtracting the fixed field size from the record's declared data length. A crafted RRSIG record with a data length smaller than the fixed fields causes this calculation to underflow, potentially resulting in an out-of-bounds read and process crash.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A heap buffer overflow was discovered in dnsmasq's DHCP script helper process. When processing DHCPv6 client identifiers (CLIDs), the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can overflow the buffer with attacker-controlled content. The helper process runs with root privileges.
8.8 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A validation bypass was discovered in dnsmasq's RFC 7871 client subnet (ECS) handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely bypassing ECS source validation and allowing an attacker to spoof client subnet information.
6.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.
8.2 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in glibc (GNU C Library). This vulnerability occurs when an application uses the `scanf` family of functions with a `%mc` format specifier, which is used for dynamically allocating memory for character input, and provides an explicit width greater than 1024. This specific combination can lead to a one-byte heap buffer overflow, potentially allowing an attacker to corrupt memory.
5.0 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.
7.1 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
7.4 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.
8.2 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
References
62 references
Acknowledgments
AISLE Research Team
Joshua Rogers
Stella
Haruto Kimura
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{
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"cwe": {
"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
},
"discovery_date": "2026-04-14T22:32:21.880000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458516"
}
],
"notes": [
{
"category": "description",
"text": "A denial of service vulnerability was discovered in dnsmasq\u0027s DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap can cause an infinite loop, making dnsmasq unresponsive to all queries.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dnsmasq: NSEC bitmap parsing infinite loop",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue affects deployments with DNSSEC validation enabled (--dnssec). The flaw is reachable before RRSIG signature validation, meaning no valid DNSSEC signatures are required to trigger it. However, the primary impact is limited to denial of service.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458516"
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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-4890"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4890",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4890"
},
{
"category": "external",
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"url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
}
],
"release_date": "2026-05-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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"scores": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"threats": [
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"category": "impact",
"details": "Important"
}
],
"title": "dnsmasq: NSEC bitmap parsing infinite loop"
},
{
"cve": "CVE-2026-4891",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-04-14T22:39:35.826000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458517"
}
],
"notes": [
{
"category": "description",
"text": "A heap out-of-bounds read vulnerability was discovered in dnsmasq\u0027s DNSSEC validation. When processing RRSIG records, dnsmasq calculates the signature length by subtracting the fixed field size from the record\u0027s declared data length. A crafted RRSIG record with a data length smaller than the fixed fields causes this calculation to underflow, potentially resulting in an out-of-bounds read and process crash.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dnsmasq: RRSIG rdlen underflow leading to heap OOB read",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
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"references": [
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"summary": "Canonical URL",
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"category": "external",
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"category": "external",
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4891"
},
{
"category": "external",
"summary": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
"url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
}
],
"release_date": "2026-05-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "dnsmasq: RRSIG rdlen underflow leading to heap OOB read"
},
{
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"cwe": {
"id": "CWE-122",
"name": "Heap-based Buffer Overflow"
},
"discovery_date": "2026-04-14T22:44:58.432000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458518"
}
],
"notes": [
{
"category": "description",
"text": "A heap buffer overflow was discovered in dnsmasq\u0027s DHCP script helper process. When processing DHCPv6 client identifiers (CLIDs), the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can overflow the buffer with attacker-controlled content. The helper process runs with root privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dnsmasq: DHCPv6 CLID buffer overflow in helper process",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat rates this as Important. The overflow occurs in a root-privileged helper process with attacker-controlled content, and the `--dhcp-script` option is enabled by default in libvirt virtual network configurations, which affects RHEL systems using virt-manager, virt-install, or cockpit-machines. Exploitation requires the attacker to send crafted DHCPv6 packets from within the virtual network, meaning a malicious VM guest could potentially exploit this for host-level code execution as root.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"summary": "RHBZ#2458518",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458518"
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-4892"
},
{
"category": "external",
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},
{
"category": "external",
"summary": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
"url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
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"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"threats": [
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"details": "Important"
}
],
"title": "dnsmasq: DHCPv6 CLID buffer overflow in helper process"
},
{
"cve": "CVE-2026-4893",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2026-04-14T22:50:18.517000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458519"
}
],
"notes": [
{
"category": "description",
"text": "A validation bypass was discovered in dnsmasq\u0027s RFC 7871 client subnet (ECS) handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely bypassing ECS source validation and allowing an attacker to spoof client subnet information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dnsmasq: Broken ECS source validation bypass",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat rates this as Moderate. This issue affects deployments with the `--add-subnet` option enabled. The impact is limited to bypassing ECS source validation, which could allow cache manipulation scoped to specific subnets or minor information disclosure about network topology.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-4893"
},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4893"
},
{
"category": "external",
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"url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
}
],
"release_date": "2026-05-09T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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{
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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],
"threats": [
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}
],
"title": "dnsmasq: Broken ECS source validation bypass"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
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},
"discovery_date": "2026-05-06T19:50:31.302000+00:00",
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2467450"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Information disclosure via heap overread in RSA key exchange",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467450"
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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-5260"
},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5260"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10"
}
],
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{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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"title": "gnutls: gnutls: Information disclosure via heap overread in RSA key exchange"
},
{
"cve": "CVE-2026-5450",
"cwe": {
"id": "CWE-131",
"name": "Incorrect Calculation of Buffer Size"
},
"discovery_date": "2026-04-20T21:01:35.403778+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2459853"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in glibc (GNU C Library). This vulnerability occurs when an application uses the `scanf` family of functions with a `%mc` format specifier, which is used for dynamically allocating memory for character input, and provides an explicit width greater than 1024. This specific combination can lead to a one-byte heap buffer overflow, potentially allowing an attacker to corrupt memory.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "glibc: glibc: Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Because this flaw requires that an affected application call the affected functions with an attacker-supplied value, Red Hat assesses the Attack Complexity of this flaw as High. Additionally, the flaw overflows a single byte onto the heap, so meaningful exploitation requires that the heap is structured such that a single byte can lead to an attacker-controlled outcome, or that the affected functions can be invoked with an attacker-controlled buffer base address. Regarding Attack Vector and Privileges Required, Red Hat assesses these elements as Local and Low respectively, as remote unauthenticated exploitation would require all the conditions above in a library client that listened on a network port and processed attacker-controllable data with the affected library functions.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
{
"category": "external",
"summary": "RHBZ#2459853",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459853"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-5450",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5450"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5450",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5450"
},
{
"category": "external",
"summary": "https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u",
"url": "https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5450#range-21286997",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5450#range-21286997"
},
{
"category": "external",
"summary": "https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450",
"url": "https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450"
}
],
"release_date": "2026-04-20T20:55:41.170000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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{
"category": "workaround",
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.0,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H",
"version": "3.1"
},
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}
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"threats": [
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}
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"title": "glibc: glibc: Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42009",
"cwe": {
"id": "CWE-475",
"name": "Undefined Behavior for Input to API"
},
"discovery_date": "2026-05-06T16:32:32.382000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467279"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The impact for this flaw has been downgraded on Red Hat Enterprise Linux due to the following reason:\n\n- The number of elements passed to the vulnerable function at runtime is known and is at most 6 and the element size is sufficiently small. glibc\u2019s qsort implementation will not exercise the quick sort code path, which would otherwise cause an infloop or out-of-bound write.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"category": "external",
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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42009"
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{
"category": "external",
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}
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"remediations": [
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"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
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}
],
"title": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42010",
"cwe": {
"id": "CWE-170",
"name": "Improper Null Termination"
},
"discovery_date": "2026-05-06T16:57:37.044000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467289"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest\u2013Shamir\u2013Adleman \u2013 Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Authentication Bypass via NUL Character in Username",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42010"
},
{
"category": "external",
"summary": "RHBZ#2467289",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467289"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42010",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42010"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
"product_ids": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40762"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
},
"products": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "gnutls: gnutls: Authentication Bypass via NUL Character in Username"
},
{
"acknowledgments": [
{
"names": [
"Haruto Kimura"
],
"organization": "Stella"
}
],
"cve": "CVE-2026-42011",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-05-06T19:06:25.319000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467437"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Security bypass due to incorrect name constraint handling",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42011"
},
{
"category": "external",
"summary": "RHBZ#2467437",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42011",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42011"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
"product_ids": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40762"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Security bypass due to incorrect name constraint handling"
},
{
"acknowledgments": [
{
"names": [
"Haruto Kimura"
],
"organization": "Stella"
},
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42013",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-05-06T19:47:00.134000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467448"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42013"
},
{
"category": "external",
"summary": "RHBZ#2467448",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467448"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42013",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42013"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42013",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42013"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-22T12:55:49+00:00",
"details": "For OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n (For x86_64 architecture)\n The image digest is sha256:8367df5ccbec71bfd55d827da81c659e301e17073b8a1a47e43d3e201adb4fd1\n\n (For s390x architecture)\n The image digest is sha256:8eb5fa80e5e92443a0870c876e82b03971051c4285d9f71ef025eea098448dff\n\n (For ppc64le architecture)\n The image digest is sha256:5d7790ac52e357afe0a15363f4eefd505029cc49a3fc147787cc5b96d8bbc666\n\n (For aarch64 architecture)\n The image digest is sha256:ed4761bb6a0bb26e5250aa36776dbe48d9ccab7fb1a05a253aa6ef2d59d32fde\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
"product_ids": [
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"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40762"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
"version": "3.1"
},
"products": [
"9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202607151909-0",
"9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202607151909-0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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