libaom Encoder out-of-bounds write

Summaryinfo

A vulnerability labeled as critical has been found in libaom. The affected element is an unknown function of the component Encoder. Executing a manipulation can lead to out-of-bounds write. This vulnerability is handled as CVE-2026-56209. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in libaom (the affected version unknown). This vulnerability affects an unknown part of the component Encoder. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2026-56209 since 06/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (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.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• libaom

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• 🔒

CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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