CVE-2026-4424: libarchive Out-of-bounds Read

Vulnerability summary

CVE-2026-4424 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in libarchive. EPSS estimates a 1.11% chance of exploitation in the next 30 days, higher than 65.5% of scored vulnerabilities.

Timeline

1. 19-03-2026
   PublishedVulnerability first disclosed.
2. 14-10-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.