CVE-2026-56208

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

CVSS 3.1 7.6 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-56208

Published

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.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

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6 Nov 2026 08:36:20 UTC