RHSA-2026:13736
Vulnerability from csaf_redhat - Published: 2026-05-06 19:58 - Updated: 2026-05-06 20:17Summary
Red Hat Security Advisory: OpenShift Container Platform 4.18.40 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.18.40 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 4.18.
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 4.18.40. See the following advisory for the RPM packages for this release:
https://access.redhat.com/errata/RHBA-2026:13726
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/4.18/html/release_notes/
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 cmd/go. An attacker can exploit this by building a malicious Go source file that uses the '#cgo pkg-config:' directive. This allows the attacker to write to an arbitrary file with partial control over its content, by providing a '--log-file' argument to the pkg-config command. This vulnerability can lead to arbitrary file write.
8.6 (High)
Vendor Fix
For OpenShift Container Platform 4.18 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:
https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/
You 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.
The sha values for the release are as follows:
(For x86_64 architecture)
The image digest is sha256:b2e85618a5a68065589d092f1894e1327e30615333ec315039aadb7908266ad4
(For s390x architecture)
The image digest is sha256:37e5d96fdc1609c79a261eb7c497f70492c22e997878efd526f18eaf044a1725
(For ppc64le architecture)
The image digest is sha256:867fc0077c615f7bcfd8679a9dd5376b25f7150444ea34ff5e6953e8b477b9df
(For aarch64 architecture)
The image digest is sha256:e578856046a41e3d6ca9a4c95b5151491cd052e29780096f42cde0b33d5f4112
All OpenShift Container Platform 4.18 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/4.18/html-single/updating_clusters/index#updating-cluster-cli.
https://access.redhat.com/errata/RHSA-2026:13736
Workaround
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.
References
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"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:a1dc7c8426be6fe50866bd60aba3e38c9aac2ded17a1313bba5798a7fbba41f3_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:cd5eae9f5e11f226884490d00ece8276a7505f839df6831bd916ac40652ed10c_s390x",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:fb6b3ecd469791591461952e73013eb25861d339bd1f0219df414e585ce7465c_amd64"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2434433"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in cmd/go. An attacker can exploit this by building a malicious Go source file that uses the \u0027#cgo pkg-config:\u0027 directive. This allows the attacker to write to an arbitrary file with partial control over its content, by providing a \u0027--log-file\u0027 argument to the pkg-config command. This vulnerability can lead to arbitrary file write.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cmd/go: cmd/go: Arbitrary file write via malicious pkg-config directive",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is Important rather than Moderate because compiling a malicious Go source file can cause `pkg-config` to create or append data to files at attacker-chosen locations, subject to the permissions of the build user. This can enable unintended filesystem modifications during the build process, which can lead to broken builds, alter tool behavior, and poison caches or artifacts, even without direct code execution.",
"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": [
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:07a4e4ee921cba5f48cbeb44e011b7029deebd7db0c06778d4c903a771ddcee3_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:3ea09fbe33e1dc258ef50841222f93c9b4903c7a6c9a3317e65bfb63b328770c_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:7af5feff1d870a66c8bcf876a513d4c617e130860a2e1943ed31a39437dab4dc_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:b4e0ebc6a017a0f85fd97f70c6c4cb8f6e264429d54e326b1602813911b5d789_s390x"
],
"known_not_affected": [
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:13a183a1ca1504eaccf23f60959d49c180036c9ff005b5e7a77b8626dbf76092_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:a1dc7c8426be6fe50866bd60aba3e38c9aac2ded17a1313bba5798a7fbba41f3_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:cd5eae9f5e11f226884490d00ece8276a7505f839df6831bd916ac40652ed10c_s390x",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:fb6b3ecd469791591461952e73013eb25861d339bd1f0219df414e585ce7465c_amd64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-61731"
},
{
"category": "external",
"summary": "RHBZ#2434433",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2434433"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-61731",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-61731"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-61731",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61731"
},
{
"category": "external",
"summary": "https://go.dev/cl/736711",
"url": "https://go.dev/cl/736711"
},
{
"category": "external",
"summary": "https://go.dev/issue/77100",
"url": "https://go.dev/issue/77100"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc",
"url": "https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-4339",
"url": "https://pkg.go.dev/vuln/GO-2026-4339"
}
],
"release_date": "2026-01-28T19:30:30.844000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-06T19:58:31+00:00",
"details": "For OpenShift Container Platform 4.18 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/4.18/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:b2e85618a5a68065589d092f1894e1327e30615333ec315039aadb7908266ad4\n\n (For s390x architecture)\n The image digest is sha256:37e5d96fdc1609c79a261eb7c497f70492c22e997878efd526f18eaf044a1725\n\n (For ppc64le architecture)\n The image digest is sha256:867fc0077c615f7bcfd8679a9dd5376b25f7150444ea34ff5e6953e8b477b9df\n\n (For aarch64 architecture)\n The image digest is sha256:e578856046a41e3d6ca9a4c95b5151491cd052e29780096f42cde0b33d5f4112\n\nAll OpenShift Container Platform 4.18 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/4.18/html-single/updating_clusters/index#updating-cluster-cli.",
"product_ids": [
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:07a4e4ee921cba5f48cbeb44e011b7029deebd7db0c06778d4c903a771ddcee3_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:3ea09fbe33e1dc258ef50841222f93c9b4903c7a6c9a3317e65bfb63b328770c_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:7af5feff1d870a66c8bcf876a513d4c617e130860a2e1943ed31a39437dab4dc_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:b4e0ebc6a017a0f85fd97f70c6c4cb8f6e264429d54e326b1602813911b5d789_s390x"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:13736"
},
{
"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": [
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:13a183a1ca1504eaccf23f60959d49c180036c9ff005b5e7a77b8626dbf76092_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:a1dc7c8426be6fe50866bd60aba3e38c9aac2ded17a1313bba5798a7fbba41f3_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:cd5eae9f5e11f226884490d00ece8276a7505f839df6831bd916ac40652ed10c_s390x",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:fb6b3ecd469791591461952e73013eb25861d339bd1f0219df414e585ce7465c_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:07a4e4ee921cba5f48cbeb44e011b7029deebd7db0c06778d4c903a771ddcee3_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:3ea09fbe33e1dc258ef50841222f93c9b4903c7a6c9a3317e65bfb63b328770c_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:7af5feff1d870a66c8bcf876a513d4c617e130860a2e1943ed31a39437dab4dc_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:b4e0ebc6a017a0f85fd97f70c6c4cb8f6e264429d54e326b1602813911b5d789_s390x"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:13a183a1ca1504eaccf23f60959d49c180036c9ff005b5e7a77b8626dbf76092_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:a1dc7c8426be6fe50866bd60aba3e38c9aac2ded17a1313bba5798a7fbba41f3_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:cd5eae9f5e11f226884490d00ece8276a7505f839df6831bd916ac40652ed10c_s390x",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/driver-toolkit-rhel9@sha256:fb6b3ecd469791591461952e73013eb25861d339bd1f0219df414e585ce7465c_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:07a4e4ee921cba5f48cbeb44e011b7029deebd7db0c06778d4c903a771ddcee3_arm64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:3ea09fbe33e1dc258ef50841222f93c9b4903c7a6c9a3317e65bfb63b328770c_ppc64le",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:7af5feff1d870a66c8bcf876a513d4c617e130860a2e1943ed31a39437dab4dc_amd64",
"Red Hat OpenShift Container Platform 4.18:registry.redhat.io/openshift4/ose-tests-rhel9@sha256:b4e0ebc6a017a0f85fd97f70c6c4cb8f6e264429d54e326b1602813911b5d789_s390x"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "cmd/go: cmd/go: Arbitrary file write via malicious pkg-config directive"
}
]
}
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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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