| Name | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1131444 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libarchive (PTS) | bullseye | 3.4.3-2+deb11u1 | vulnerable |
| bullseye (security) | 3.4.3-2+deb11u3 | vulnerable |
| bookworm | 3.6.2-1+deb12u3 | vulnerable |
| bookworm (security) | 3.6.2-1+deb12u2 | vulnerable |
| trixie | 3.7.4-4 | vulnerable |
| forky, sid | 3.8.5-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libarchive | source | (unstable) | (unfixed) | | | 1131444 |
Notes
[trixie] - libarchive <postponed> (Minor issue, revisit when fixed upstream)
[bookworm] - libarchive <postponed> (Minor issue, revisit when fixed upstream)
https://github.com/libarchive/libarchive/pull/2897