CVE-2026-56211 Libaom: libaom: remote code execution via svc layer context handling with attacker-controlled frames
Remote attackers can execute arbitrary code by sending crafted video frames to services using libaom with SVC encoding enabled.
- 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-2026-56211?
CVE-2026-56211 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 remote code execution vulnerability was found in libaom, the reference AV1 codec implementation. Insufficient bounds validation in the AV1 encoder's SVC (Scalable Video Coding) layer ID control allows an attacker to supply crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, an attacker can use this to hijack the cyclic refresh map pointer, brute-force the process base address via a crash oracle, and redirect control flow to achieve arbitrary command execution. Exploitation requires the target service to use libaom with SVC encoding enabled and accept attacker-supplied video frames.
Weakness: CWE-787
Which versions are affected by CVE-2026-56211?
How do I fix CVE-2026-56211?
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-2026-56211 being exploited?
There is no known exploitation of CVE-2026-56211 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-56211, ECHO-5509-692b-aa69, GHSA-qr4p-j2pf-4w4x, ROOT-OS-DEBIAN-11-CVE-2026-56211, UBUNTU-CVE-2026-56211.