CVE-2026-4426 MEDIUM

CVE-2026-4426: Libarchive: libarchive: denial of service via malformed iso file processing

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-1335
Published March 19, 2026
Last update May 3, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 19, 2026 CVE published
May 3, 2026 Record updated