RHSA-2026:54525
Vulnerability from csaf_redhat - Published: 2026-08-13 10:25 - Updated: 2026-08-16 19:39A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64 | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64 | — |
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A flaw was found in golang.org/x/crypto/ssh. SSH servers configured to use CertChecker as a public key callback, without explicitly setting IsUserAuthority or IsHostAuthority, are vulnerable. A remote attacker can exploit this by presenting a specially crafted certificate, causing the server to panic and resulting in a Denial of Service (DoS).
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64 | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64 | — |
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A flaw was found in Billy, an interface filesystem abstraction for Go. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing crafted or malformed input. The issue arises from insufficient validation and missing safety mechanisms when processing untrusted repository data and filesystem structures, leading to panics, infinite loops, uncontrolled recursion, or excessive resource consumption.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64 | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64 | — |
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A flaw was found in golang.org/x/text. The norm.Iter component can enter an infinite loop when processing input that contains invalid UTF-8 (Unicode Transformation Format - 8-bit) bytes. A remote attacker could exploit this vulnerability by providing specially crafted input, leading to a Denial of Service (DoS) condition where the affected application becomes unresponsive.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64 | — |
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fix
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le | — |
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| Unresolved product id: external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64 | — |
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"vulnerabilities": [
{
"cve": "CVE-2026-27145",
"cwe": {
"id": "CWE-606",
"name": "Unchecked Input for Loop Condition"
},
"discovery_date": "2026-06-02T23:01:08.992540+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2484207"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).",
"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"
}
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"url": "https://go.dev/cl/783621"
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"url": "https://go.dev/issue/79694"
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"url": "https://pkg.go.dev/vuln/GO-2026-5037"
}
],
"release_date": "2026-06-02T22:01:36.954000+00:00",
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},
{
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},
{
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"id": "CWE-476",
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},
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"system_name": "Red Hat Bugzilla ID",
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{
"category": "description",
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"title": "Vulnerability description"
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{
"category": "summary",
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in `golang.org/x/crypto/ssh` affecting SSH servers that utilize `CertChecker` as a public key callback without explicitly configuring `IsUserAuthority` or `IsHostAuthority`. A remote, unauthenticated attacker can trigger a server panic by presenting a specially crafted certificate, leading to service disruption. Exploitation requires a specific, non-default configuration of the `CertChecker`.",
"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"
}
],
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{
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{
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{
"category": "external",
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{
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"title": "golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate"
},
{
"cve": "CVE-2026-44740",
"cwe": {
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},
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"ids": [
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"title": "Vulnerability description"
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},
{
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"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"
}
],
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},
{
"cve": "CVE-2026-56852",
"cwe": {
"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
},
"discovery_date": "2026-07-21T20:01:56.266823+00:00",
"ids": [
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{
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Important: This flaw in the `golang.org/x/text` library can lead to a denial of service. An attacker could provide specially crafted invalid UTF-8 input to an application using the affected `norm.Iter` functionality, causing it to enter an infinite loop and become unresponsive.",
"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": [
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-56852"
},
{
"category": "external",
"summary": "RHBZ#2504233",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504233"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-56852",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56852"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56852",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56852"
},
{
"category": "external",
"summary": "https://go.dev/cl/794100",
"url": "https://go.dev/cl/794100"
},
{
"category": "external",
"summary": "https://go.dev/issue/80142",
"url": "https://go.dev/issue/80142"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5970",
"url": "https://pkg.go.dev/vuln/GO-2026-5970"
}
],
"release_date": "2026-07-21T19:18:59.951000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-13T10:25:25+00:00",
"details": "Before installing the operator, make sure all previously released errata relevant to your system have been applied.\n\nThe steps to apply the upgraded images will differ depending on the installation plan approval policy that will be used\nwhile installing the external secrets operator for Red Hat OpenShift.\n\n- If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a\nnew version of the Operator. No further action is required to upgrade. This is the default setting.\n\n- If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator.",
"product_ids": [
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:54525"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64"
]
}
],
"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"
},
"products": [
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:27d536de88403ec57239e6fb4c674fd2c5736fefd093df009af4089fb55a682a_arm64",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:534f8dce891c9efd0155ab9408150e5c166ad40f041aaedd80dea623014e66f7_s390x",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:6853e928761a2e1980838319fd89592831cda348f3d098fac9aa2873ca4db332_ppc64le",
"external secrets operator for Red Hat OpenShift 1.1:registry.redhat.io/external-secrets-operator/external-secrets-rhel9@sha256:d9cb4c7d68769f943bed8b84299e2d4df5ca209cad85bf0ff44ab80e8fe822c9_amd64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input"
}
]
}
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.
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.