RHSA-2026:68538
Vulnerability from csaf_redhat - Published: 2026-09-22 09:08 - Updated: 2026-10-05 19:12Summary
Red Hat Security Advisory: OpenShift Container Platform 4.21.34 packages and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.21.34 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 4.21.
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 RPM packages for Red Hat OpenShift Container Platform 4.21.34. See the following advisory for the container images for this release:
https://access.redhat.com/errata/RHSA-2026:68546
Security Fix(es):
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
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 4.21 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/4.21/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 flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 10Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el10.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 10Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el10.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 10Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el10.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 10Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el10.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 10Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 8Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 8Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el8.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 8Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el8.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 8Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el9.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el9.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el9.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 9Base-RHOSE-4.21:ose-gcp-gcr-image-credential-provider-0:4.21.0-202609141848.p2.g0b668ce.assembly.stream.el9.x86_64 | — |
Vendor Fix
fix
|
Known not affected
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-0:1.34.13-6.rhaos4.21.git6253162.el9.aarch64 | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-0:1.34.13-6.rhaos4.21.git6253162.el9.ppc64le | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-0:1.34.13-6.rhaos4.21.git6253162.el9.s390x | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-0:1.34.13-6.rhaos4.21.git6253162.el9.src | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-0:1.34.13-6.rhaos4.21.git6253162.el9.x86_64 | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debuginfo-0:1.34.13-6.rhaos4.21.git6253162.el9.aarch64 | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debuginfo-0:1.34.13-6.rhaos4.21.git6253162.el9.ppc64le | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debuginfo-0:1.34.13-6.rhaos4.21.git6253162.el9.s390x | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debuginfo-0:1.34.13-6.rhaos4.21.git6253162.el9.x86_64 | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debugsource-0:1.34.13-6.rhaos4.21.git6253162.el9.aarch64 | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debugsource-0:1.34.13-6.rhaos4.21.git6253162.el9.ppc64le | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debugsource-0:1.34.13-6.rhaos4.21.git6253162.el9.s390x | — | ||
| Unresolved product id: 9Base-RHOSE-4.21:cri-o-debugsource-0:1.34.13-6.rhaos4.21.git6253162.el9.x86_64 | — |
Threats
Impact
Important
References
12 references
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"vulnerabilities": [
{
"cve": "CVE-2026-56862",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-08-13T22:16:41.928450+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515839"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-56862"
},
{
"category": "external",
"summary": "RHBZ#2515839",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
},
{
"category": "external",
"summary": "https://go.dev/cl/804261",
"url": "https://go.dev/cl/804261"
},
{
"category": "external",
"summary": "https://go.dev/issue/80528",
"url": "https://go.dev/issue/80528"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-6090",
"url": "https://pkg.go.dev/vuln/GO-2026-6090"
}
],
"release_date": "2026-08-13T21:58:53.216000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T09:08:03+00:00",
"details": "For OpenShift Container Platform 4.21 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/4.21/html/release_notes/",
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"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",
"details": "Important"
}
],
"title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
}
]
}
Loading…
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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