CVE-2026-4426

Name: CVE-2026-4426
Creator: NVD / NIST
Published: 2026-03-19T15:16:28.51+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-4426 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.30%

22.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1335

Affected Software

Vendor	Product	Versions
Libarchive	Libarchive	All versions
Redhat	Hardened Images	All versions
Redhat	Openshift Container Platform	4.0
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Redhat	Enterprise Linux	10.0

References

https://access.redhat.com/errata/RHSA-2026:8944
https://access.redhat.com/security/cve/CVE-2026-4426Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2449010Issue Tracking, Third Party Advisory
https://github.com/libarchive/libarchive/pull/2897Issue Tracking, Patch

Timeline

Published: Mar 19, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-4426?

How severe is CVE-2026-4426?

CVE-2026-4426 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-4426?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-4426?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST