| Name | CVE-2026-4424 |
| Description | A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction. |
| 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 | 1131446 |
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) | | | 1131446 |
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/2898