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Vulnerabilities CVE-2026-56208

CVE-2026-56208

High
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
7.6
EPSS Score
0.33%

25.9th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Confidence
90%
Published
Jun 19, 2026
Last Modified
Aug 7, 2026
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