RHSA-2026:8944

Vulnerability from csaf_redhat - Published: 2026-04-20 10:34 - Updated: 2026-04-29 09:52
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: libarchive: * bsdcat-3.8.7-1.hum1 (aarch64, x86_64) * bsdcpio-3.8.7-1.hum1 (aarch64, x86_64) * bsdtar-3.8.7-1.hum1 (aarch64, x86_64) * bsdunzip-3.8.7-1.hum1 (aarch64, x86_64) * libarchive-3.8.7-1.hum1 (aarch64, x86_64) * libarchive-devel-3.8.7-1.hum1 (aarch64, x86_64) * libarchive-3.8.7-1.hum1.src (src)
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-2025-60753

A vulnerability in apply_substitution() function in libarchive's bsdtar allows crafted -s substitution rules to repeatedly match a zero-length substring and append replacements without advancing the input pointer. When the rule uses the global /g flag (or an explicitly empty pattern), this leads to unbounded output allocation and eventual process OOM (Denial of Service). Upgrade to libarchive 3.8.1 or apply a patch that prevents zero-length match loops or rejects empty patterns.

5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:8944
Workaround No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.
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 details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:8944
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.
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
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:8944
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.
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
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:8944
Workaround 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.
References
https://access.redhat.com/errata/RHSA-2026:8944 self
https://images.redhat.com/ external
https://access.redhat.com/security/cve/CVE-2025-60753 external
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/security/cve/CVE-2026-4424 external
https://access.redhat.com/security/cve/CVE-2026-4111 external
https://access.redhat.com/security/cve/CVE-2026-5121 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-60753 self
https://bugzilla.redhat.com/show_bug.cgi?id=2412648 external
https://www.cve.org/CVERecord?id=CVE-2025-60753 external
https://nvd.nist.gov/vuln/detail/CVE-2025-60753 external
https://github.com/Papya-j/CVE/tree/main/CVE-2025-60753 external
https://github.com/libarchive/libarchive/issues/2725 external
https://access.redhat.com/security/cve/CVE-2026-4111 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446453 external
https://www.cve.org/CVERecord?id=CVE-2026-4111 external
https://nvd.nist.gov/vuln/detail/CVE-2026-4111 external
https://github.com/libarchive/libarchive/pull/2877 external
https://access.redhat.com/security/cve/CVE-2026-4424 self
https://bugzilla.redhat.com/show_bug.cgi?id=2449006 external
https://www.cve.org/CVERecord?id=CVE-2026-4424 external
https://nvd.nist.gov/vuln/detail/CVE-2026-4424 external
https://github.com/libarchive/libarchive/pull/2898 external
https://access.redhat.com/security/cve/CVE-2026-5121 self
https://bugzilla.redhat.com/show_bug.cgi?id=2452945 external
https://www.cve.org/CVERecord?id=CVE-2026-5121 external
https://nvd.nist.gov/vuln/detail/CVE-2026-5121 external
https://github.com/advisories/GHSA-2vwv-vqpv-v8vc external
https://github.com/libarchive/libarchive/pull/2934 external
Acknowledgments
Elhanan Haenel
To clipboard 

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          "title": "Vulnerability description"
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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            "version": "3.1"
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      ],
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          "details": "Moderate"
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      "title": "libarchive: bsdtar hangs and OOMs with zero-length pattern matches"
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          "title": "Vulnerability description"
        },
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          "text": "libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive",
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        },
        {
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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.",
          "title": "Statement"
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            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "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": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive"
    },
    {
      "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"
        },
        {
          "category": "summary",
          "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": {
        "fixed": [
          "Red Hat Hardened Images:libarchive-main@aarch64",
          "Red Hat Hardened Images:libarchive-main@src",
          "Red Hat Hardened Images:libarchive-main@x86_64"
        ]
      },
      "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": "2026-04-20T10:34:46+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:8944"
        },
        {
          "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 Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "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": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "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": [
          "Red Hat Hardened Images:libarchive-main@aarch64",
          "Red Hat Hardened Images:libarchive-main@src",
          "Red Hat Hardened Images:libarchive-main@x86_64"
        ]
      },
      "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": "2026-04-20T10:34:46+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:8944"
        },
        {
          "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": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "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": [
            "Red Hat Hardened Images:libarchive-main@aarch64",
            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ]
        }
      ],
      "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.