CVE-2026-4424: Libarchive

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Libarchive Libarchive: affected versions not specified
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Enterprise Linux Server Aus: version 8.2 only; version 8.4 only
• Red Hat Hardened Images: affected versions not specified
• Red Hat Openshift Container Platform: version 4.0 only; version 4.16 only
• Red Hat Openshift Container Platform For ARM64: version 4.16 only
• Red Hat Openshift Container Platform For Power: version 4.16 only

Published 2026-03-19. Last modified 2026-09-29.