CVE-2026-56209
HIGH EPSS 17.9%
Published Jun 19, 20261w ago · Modified Jun 22, 20261w ago
7.1 CVSS 3.1
Published Jun 19, 2026 1w ago
Last Modified Jun 22, 2026 1w ago
Description
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity Low
Availability High
Threat Intelligence
EPSS Exploit Probability
17.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-787 Out-of-bounds Write Memory Safety
References 4
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-56209
- aomedia.googlesource.com https://aomedia.googlesource.com/aom/+/a93ba0ffaa
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2490800
- issues.chromium.org https://issues.chromium.org/issues/503993984
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.