RHSA-2026:8944

Vulnerability from csaf_redhat - Published: 2026-04-20 10:34 - Updated: 2026-04-23 06:09
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-2026-4424

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.
References
Acknowledgments
Elhanan Haenel
To clipboard 

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        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "discovery_date": "2025-11-05T16:00:52.316475+00:00",
      "ids": [
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          "text": "2412648"
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      "notes": [
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          "text": "A vulnerability in apply_substitution() function in libarchive\u0027s 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.",
          "title": "Vulnerability description"
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        {
          "category": "summary",
          "text": "libarchive: bsdtar hangs and OOMs with zero-length pattern matches",
          "title": "Vulnerability summary"
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          "text": "This vulnerability is rated Moderate rather than Important because its impact is limited to availability and requires user interaction under specific, non-default conditions. Exploitation is only possible when an attacker can directly supply or influence the -s substitution rule passed to bsdtar, which is uncommon in most deployment scenarios since bsdtar is typically invoked with trusted command-line arguments in controlled environments. The flaw does not enable memory corruption, arbitrary code execution, or privilege escalation\u2014it solely results in an infinite loop and memory exhaustion (OOM) leading to a process crash.",
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        },
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            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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          ]
        }
      ],
      "threats": [
        {
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          "details": "Moderate"
        }
      ],
      "title": "libarchive: bsdtar hangs and OOMs with zero-length pattern matches"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Elhanan Haenel"
          ]
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      ],
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        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-03-19T12:22:21.740000+00:00",
      "ids": [
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          "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": {
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        },
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      "remediations": [
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          "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": [
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            "Red Hat Hardened Images:libarchive-main@src",
            "Red Hat Hardened Images:libarchive-main@x86_64"
          ],
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        },
        {
          "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"
    }
  ]
}


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  • 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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