CVE-2026-4426 (Medium) detected in libarchivev3.8.5

[mend-bolt-for-github]

CVE-2026-4426 - Medium Severity Vulnerability

Vulnerable Library - libarchivev3.8.5

Multi-format archive and compression library

Library home page: https://github.com/libarchive/libarchive.git

Found in base branches: stable/4.0, master

Vulnerable Source Files (1)

/contrib/libarchive/libarchive/archive_read_support_format_iso9660.c

Vulnerability Details

A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field ("pz_log2_bs") read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.

Publish Date: 2026-03-19

URL: CVE-2026-4426

CVSS 3 Score Details (6.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-03-19

Fix Resolution: https://github.com/libarchive/libarchive.git - v3.8.6

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