CVE-2026-4426
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 3.6.2-1+deb12u4 |
| debian | bullseye | fixed | 3.4.3-2+deb11u4 |
| debian | forky | fixed | 3.8.7-1 |
| debian | sid | fixed | 3.8.7-1 |
| debian | trixie | fixed | 3.7.4-4+deb13u1 |
| sles | affected | | |
| rhel | 6.0 | affected | |
| rhel | 7.0 | affected | |
| rhel | 8.0 | affected | |
| rhel | 9.0 | affected | |
| rhel | 10.0 | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| libarchive | libarchive | - | |
| redhat | hardened_images | - | |
| redhat | openshift_container_platform | 4.0 | |
References
- https://access.redhat.com/errata/RHSA-2026:8944
- https://access.redhat.com/security/cve/CVE-2026-4426
- https://bugzilla.redhat.com/show_bug.cgi?id=2449010
- https://github.com/libarchive/libarchive/pull/2897
- https://security-tracker.debian.org/tracker/CVE-2026-4426
- https://www.suse.com/security/cve/CVE-2026-4426.html
CWEs
CWE-1335
💬 Discuss CVE-2026-4426 on VIR Community →
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.