| Name | CVE-2026-56208 |
| Description | A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution. |
| 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 | 1140428 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| aom (PTS) | bullseye | 1.0.0.errata1-3+deb11u1 | fixed |
| bullseye (security) | 1.0.0.errata1-3+deb11u2 | fixed |
| bookworm | 3.6.0-1+deb12u2 | vulnerable |
| bookworm (security) | 3.6.0-1+deb12u1 | vulnerable |
| trixie | 3.12.1-1 | vulnerable |
| forky, sid | 3.13.1-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| aom | source | bullseye | (not affected) | | | |
| aom | source | (unstable) | (unfixed) | | | 1140428 |
Notes
[bullseye] - aom <not-affected> (1.0.0 lacks LAP two-pass mode (encoder), introduced upstream in 2.0.0)
https://aomedia.googlesource.com/aom/+/243f8ae84bfbc495b3a3c12948abc4dff3af2f84
https://bugzilla.redhat.com/show_bug.cgi?id=2490799
https://issues.chromium.org/issues/504317456