CVE-2026-56209

CVE-2026-56209 · Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack

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This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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.

CVSS 7.1 · High · EPSS 0.6% · Fix available

Published

2026-06-19T16:28:26.462Z

Updated

2026-10-19T11:20:45.987Z

Stack: system

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