CVE-2026-4426

MEDIUM CVSS 3.1: 6.5 EPSS 0.56%
Updated Sep 01, 2026
Red Hat
Parameter Value
CVSS 6.5 (MEDIUM)
Type CWE-1335
Vendor Red Hat
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 8

Configuration From (including) Up to (excluding)
Libarchive Libarchive
cpe:2.3:a:libarchive:libarchive:-:*:*:*:*:*:*:*
— —
Redhat Hardened_Images
cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
— —
Redhat Openshift_Container_Platform
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
— —
Redhat Enterprise_Linux
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
— —
Redhat Enterprise_Linux
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
— —
Redhat Enterprise_Linux
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
— —
Redhat Enterprise_Linux
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
— —
Redhat Enterprise_Linux
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
— —