CVE-2026-56208 Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode
Heap buffer overflow in libaom AV1 encoder allows attackers to cause denial of service or potentially execute code via crafted encoder configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-56208?
CVE-2026-56208 is a high-severity memory corruption vulnerability in Red Hat AI Inference Server, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-56208?
How do I fix CVE-2026-56208?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-56208 being exploited?
There is no known exploitation of CVE-2026-56208 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-56208, ECHO-c281-5876-5f69, GHSA-mgv2-4j37-m3x6, ROOT-OS-DEBIAN-11-CVE-2026-56208, UBUNTU-CVE-2026-56208.