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Vulnerabilities

Vulnerability · CVE-2026-4424

Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

Published Mar 19, 2026 · catalog updated Oct 14, 2026 · Red Hat

Check if you run it

No confirmed exploitation is on record for CVE-2026-4424. EPSS is 1.11%. Act only if a listed version of Red Hat is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.11%
Remediation
Advisory link
Affected products
cpe libarchive/libarchive · cpe redhat/enterprise linux · cpe redhat/hardened images · cpe redhat/openshift container platform · cpe redhat/openshift container platform for arm64 · cpe redhat/openshift container platform for power

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe libarchive/libarchiveversion unspecified
  • cpe redhat/enterprise linux6.0
  • cpe redhat/enterprise linux7.0
  • cpe redhat/hardened imagesversion unspecified
  • cpe redhat/openshift container platform4.0
  • cpe redhat/openshift container platform4.16
  • cpe redhat/openshift container platform for arm644.16
  • cpe redhat/openshift container platform for power4.16
  • vendor Red Hat Red Hat Enterprise Linux 10version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 10.0 Extended Update Supportversion unspecified
  • vendor Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Supportversion unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Supportversion unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportversion unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onversion unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportversion unspecified

How to fix CVE-2026-4424

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4424. EPSS is 1.11%. Act only if a listed version of Red Hat is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 6.0; redhat/enterprise linux 7.0; redhat/openshift container platform 4.0; redhat/openshift container platform 4.16. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 1.11%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 19, 2026 · Catalog

    Detected

    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

  2. Oct 14, 2026 · Catalog

    Updated

    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

  3. Oct 14, 2026 · NIST NVD

    Updated

    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

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-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 specia

    vulnerability.circl.lu
  • CSAF AdvisoriesVendor advisoryRHSA-2026:9832: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 specia

    security.access.redhat.com
  • CVE.orgVulnerability recordCVE-2026-4424

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4424

    30-day exploitation probability 1.1%

    first.org
  • NIST NVDVulnerability recordCVE-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 specia

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.