Out-of-bounds Read Affecting libarchive package, versions <3.2.2-3.1ubuntu0.7+esm3


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

Social Trends
EPSS
0.88% (55th percentile)

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  • Snyk IDSNYK-UBUNTU1804-LIBARCHIVE-15754881
  • published4 Apr 2026
  • disclosed19 Mar 2026

Introduced: 19 Mar 2026

CVE-2026-4424  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 libarchive to version 3.2.2-3.1ubuntu0.7+esm3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libarchive package and not the libarchive package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

References

CVSS Base Scores

version 3.1