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RHSA-2026:12071

Vulnerability from csaf_redhat - Published: 2026-05-11 08:46 - Updated: 2026-09-01 12:02
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.18.39 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.18.39 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 4.18. 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 4.18.39. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:12069 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/ Security Fix(es): * openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables (CVE-2026-3497) * libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing (CVE-2026-4424) * libarchive: libarchive: Arbitrary code execution via integer overflow in ISO9660 image processing (CVE-2026-5121) 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 4.18 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.
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.
CVE-2026-3497

A flaw was found in the OpenSSH GSSAPI (Generic Security Service Application Program Interface) delta patches, as included in various Linux distributions. A remote attacker could exploit this by sending an unexpected GSSAPI message type during the key exchange process. This occurs because the `sshpkt_disconnect()` function, when called on an error, does not properly terminate the process, leading to the continued execution of the program with uninitialized connection variables. Accessing these uninitialized variables can lead to undefined behavior, potentially resulting in information disclosure or a denial of service.

8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CWE-824 - Access of Uninitialized Pointer
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-4424

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-125 - Out-of-bounds Read
Affected products
Fixed 4 products, the same list as for CVE-2026-3497
Threats
Impact Important
CVE-2026-5121

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-190 - Integer Overflow or Wraparound
Affected products
Fixed 4 products, the same list as for CVE-2026-3497
Threats
Impact Moderate
References
Acknowledgments
Elhanan Haenel
To clipboard 

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      "discovery_date": "2026-03-12T19:01:37.007806+00:00",
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          "title": "Vulnerability description"
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          "text": "openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables",
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        {
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          "text": "IMPORTANT: This vulnerability affects the OpenSSH GSSAPI delta as implemented in Red Hat Enterprise Linux and OpenShift Container Platform. An unauthenticated attacker could send a specially crafted GSSAPI message during key exchange, leading to the use of uninitialized variables and potentially undefined behavior. The severity of the impact is dependent on compiler hardening configurations.",
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          "summary": "https://www.openwall.com/lists/oss-security/2026/03/12/3",
          "url": "https://www.openwall.com/lists/oss-security/2026/03/12/3"
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          "date": "2026-05-11T08:46:45+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 sha256:4e97f1a9f5f5e751c7795ab6638723b064447106845f3d75d35b03a1a6c9488c\n\n      (For s390x architecture)\n      The image digest is sha256:38ce542dda6ecfabbc74da4052af74b63a2e6e00ba3c58ccb2e8610ee4fa3ba1\n\n      (For ppc64le architecture)\n      The image digest is sha256:1dc485424fa4a6fbe7864c44d2b527351d53b9f7d7bd24d349e6b25325624bdb\n\n      (For aarch64 architecture)\n      The image digest is sha256:4f700acd8ac54c1ff151c27ea9042606fef35a7874204732503656bc88e19fda\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.",
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        },
        {
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          "details": "To mitigate this issue, disable GSSAPI key exchange in the OpenSSH server configuration. This prevents the server from processing GSSAPI messages, eliminating the vulnerability\u0027s attack surface.\n\nEdit `/etc/ssh/sshd_config` and add or modify the line:\n```\nGSSAPIKeyExchange no\n```\n\nAfter saving the changes, restart the `sshd` service for the mitigation to take effect. This action will prevent users from authenticating via GSSAPI.\n\n```\n# systemctl restart sshd\n```",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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      ],
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        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Elhanan Haenel"
          ]
        }
      ],
      "cve": "CVE-2026-4424",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-03-19T12:22:21.740000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2449006"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.",
          "title": "Vulnerability description"
        },
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          "text": "libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "IMPORTANT: This heap out-of-bounds read vulnerability in libarchive\u0027s RAR archive processing logic can lead to information disclosure. A remote attacker can exploit this flaw by providing a specially crafted RAR archive, potentially revealing sensitive heap memory information without requiring authentication or user interaction on systems that process untrusted archives.",
          "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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          "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-4424"
        },
        {
          "category": "external",
          "summary": "RHBZ#2449006",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449006"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-4424",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-4424"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4424",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4424"
        },
        {
          "category": "external",
          "summary": "https://github.com/libarchive/libarchive/pull/2898",
          "url": "https://github.com/libarchive/libarchive/pull/2898"
        }
      ],
      "release_date": "2026-03-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-11T08:46:45+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 sha256:4e97f1a9f5f5e751c7795ab6638723b064447106845f3d75d35b03a1a6c9488c\n\n      (For s390x architecture)\n      The image digest is sha256:38ce542dda6ecfabbc74da4052af74b63a2e6e00ba3c58ccb2e8610ee4fa3ba1\n\n      (For ppc64le architecture)\n      The image digest is sha256:1dc485424fa4a6fbe7864c44d2b527351d53b9f7d7bd24d349e6b25325624bdb\n\n      (For aarch64 architecture)\n      The image digest is sha256:4f700acd8ac54c1ff151c27ea9042606fef35a7874204732503656bc88e19fda\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": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:12071"
        },
        {
          "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": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Elhanan Haenel"
          ]
        }
      ],
      "cve": "CVE-2026-5121",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "discovery_date": "2026-03-30T07:40:25.358335+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2452945"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libarchive: libarchive: Arbitrary code execution via integer overflow in ISO9660 image processing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Important: An integer overflow flaw in `libarchive` on 32-bit systems can lead to a heap buffer overflow. This vulnerability occurs when processing a specially crafted ISO9660 image, allowing an attacker to potentially execute arbitrary code. Red Hat Enterprise Linux 64-bit systems are not affected by this flaw.",
          "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-4.18:rhcos-aarch64-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
          "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-5121"
        },
        {
          "category": "external",
          "summary": "RHBZ#2452945",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452945"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-5121",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-5121"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5121",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5121"
        },
        {
          "category": "external",
          "summary": "https://github.com/advisories/GHSA-2vwv-vqpv-v8vc",
          "url": "https://github.com/advisories/GHSA-2vwv-vqpv-v8vc"
        },
        {
          "category": "external",
          "summary": "https://github.com/libarchive/libarchive/pull/2934",
          "url": "https://github.com/libarchive/libarchive/pull/2934"
        }
      ],
      "release_date": "2026-03-30T07:44:15.222000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-11T08:46:45+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 sha256:4e97f1a9f5f5e751c7795ab6638723b064447106845f3d75d35b03a1a6c9488c\n\n      (For s390x architecture)\n      The image digest is sha256:38ce542dda6ecfabbc74da4052af74b63a2e6e00ba3c58ccb2e8610ee4fa3ba1\n\n      (For ppc64le architecture)\n      The image digest is sha256:1dc485424fa4a6fbe7864c44d2b527351d53b9f7d7bd24d349e6b25325624bdb\n\n      (For aarch64 architecture)\n      The image digest is sha256:4f700acd8ac54c1ff151c27ea9042606fef35a7874204732503656bc88e19fda\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": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:12071"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, avoid processing untrusted ISO9660 images with applications that utilize `libarchive`. Users should only extract or read content from ISO images obtained from trusted sources.",
          "product_ids": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202604240015-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202604240015-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libarchive: libarchive: Arbitrary code execution via integer overflow in ISO9660 image processing"
    }
  ]
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.