| Name | CVE-2026-56209 |
| Description | An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential 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 the aom_svc_layer_id_t encoder control, introduced in 2.0.0)
https://aomedia.googlesource.com/aom/+/a93ba0ffaacd5f576a241bf739110e65287e516d
https://bugzilla.redhat.com/show_bug.cgi?id=2490800
https://issues.chromium.org/issues/503993984