CVE-2026-56210: aom Out-of-bounds Read

Vulnerability summary

CVE-2026-56210 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in aom. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.5% of scored vulnerabilities.

Timeline

1. 19-06-2026
   PublishedVulnerability first disclosed.
2. 19-10-2026
   Last modifiedVulnerability information updated.

Description

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-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.