libaom out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in libaom. This issue affects some unknown processing. Such manipulation leads to out-of-bounds write. This vulnerability is traded as CVE-2026-56211. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in libaom (affected version unknown). It has been rated as critical. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-56211 since 06/19/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/19/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• libaom

CPE 2.3info

• 🔒

CPE 2.2info

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