RHSA-2026:10081

Vulnerability from csaf_redhat - Published: 2026-04-29 08:54 - Updated: 2026-04-30 16:32
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.19.29 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.19.29 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 4.19.29. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:10080 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): * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive (CVE-2026-4111) 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.
CVE-2026-4111

A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Vendor Fix 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: https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/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 sha256:4e97f1a9f5f5e751c7795ab6638723b064447106845f3d75d35b03a1a6c9488c (For s390x architecture) The image digest is sha256:38ce542dda6ecfabbc74da4052af74b63a2e6e00ba3c58ccb2e8610ee4fa3ba1 (For ppc64le architecture) The image digest is sha256:1dc485424fa4a6fbe7864c44d2b527351d53b9f7d7bd24d349e6b25325624bdb (For aarch64 architecture) The image digest is sha256:4f700acd8ac54c1ff151c27ea9042606fef35a7874204732503656bc88e19fda 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. https://access.redhat.com/errata/RHSA-2026:10081
Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
Acknowledgments
Elhanan Haenel
To clipboard 

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          "text": "The Red Hat Product Security team would likely assess the severity of this vulnerability as High because it allows remote attackers to cause a persistent denial-of-service condition using a small crafted archive file. Successful exploitation requires no authentication, no special configuration, and no user interaction in environments that automatically process uploaded archives. By repeatedly submitting malicious archives, an attacker can exhaust CPU resources or worker threads in services such as file upload systems, CI/CD pipelines, mail scanners, and content indexing services that rely on libarchive for archive extraction.",
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      "remediations": [
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          "date": "2026-04-29T08:54:49+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 sha256:4e97f1a9f5f5e751c7795ab6638723b064447106845f3d75d35b03a1a6c9488c\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 4.19 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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          "details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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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"
          },
          "products": [
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            "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202604211219-0"
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive"
    }
  ]
}


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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

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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.
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  • 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.