CVE-2026-56208
HIGH EPSS 18.4%
Published Jun 19, 20261w ago · Modified Jun 22, 20261w ago
7.6 CVSS 3.1
Published Jun 19, 2026 1w ago
Last Modified Jun 22, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Low
Availability High
Threat Intelligence
EPSS Exploit Probability
18.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-122
References 4
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-56208
- aomedia.googlesource.com https://aomedia.googlesource.com/aom/+/243f8ae84b
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2490799
- issues.chromium.org https://issues.chromium.org/issues/504317456
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.