What is CVE-2026-4426?

CVE-2026-4426 is a medium-severity vulnerability in Libarchive, classified under CWE-1335. CVSS score: 6.5/10. Published 2026-03-19.

How severe is CVE-2026-4426?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Libarchive

CVE-2026-4426

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 th…

EPSS: 0.002 (40.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Libarchive
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Hardened Images — versions 3.8.7-1.hum1
Red Hat Openshift Container Platform 4
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0
Redhat Hardened_images

Weakness classification (CWE)

CWE-1335

References

RHSA-2026:8944 (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
RHBZ#2449010 (x_refsource_REDHAT, issue-tracking, Third Party Advisory, Issue Tracking)
secalert@redhat.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-4426?: CVE-2026-4426 is a medium-severity vulnerability in Libarchive, classified under CWE-1335. CVSS score: 6.5/10. Published 2026-03-19.
How severe is CVE-2026-4426?: Medium severity. CVSS v3 base score is 6.5 out of 10.