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.
Affected products
libarchive: libarchive; redhat: hardened images; redhat: openshift container platform; redhat: enterprise linux
References4
- github.com/libarchive/libarchive/pull/2897 Issue TrackingPatch
- access.redhat.com/errata/RHSA-2026:8944
- access.redhat.com/security/cve/CVE-2026-4426 Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2449010 Issue TrackingThird Party Advisory
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 25 · as of 12 November 2026
- CWE
- CWE-1335
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