CVE-2026-56208

CVE-2026-56208 · Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode

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

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.

CVSS 7.6 · High · EPSS 0.6% · Fix available

Published

2026-06-19T16:28:26.466Z

Updated

2026-10-19T11:20:43.065Z

Stack: system

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