CVE-2026-56210

A heap-buffer-overflow read 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 setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory).

• CWE-125

• https://access.redhat.com/security/cve/CVE-2026-56210
• https://aomedia.googlesource.com/aom/+/a93ba0ffaa
• https://bugzilla.redhat.com/show_bug.cgi?id=2490801
• https://issues.chromium.org/issues/503975732

Published

Jun 19, 2026

Last Modified

Jun 22, 2026

Status

Awaiting Analysis