CVE-2026-56211

Description

A remote code execution vulnerability was found in libaom, the reference AV1 codec implementation. Insufficient bounds validation in the AV1 encoder's SVC (Scalable Video Coding) layer ID control allows an attacker to supply crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, an attacker can use this to hijack the cyclic refresh map pointer, brute-force the process base address via a crash oracle, and redirect control flow to achieve arbitrary command execution. Exploitation requires the target service to use libaom with SVC encoding enabled and accept attacker-supplied video frames.

PUBLISHED Reserved 2026-06-19 | Published 2026-06-19 | Updated 2026-07-06 | Assigner redhat

Problem types

Out-of-bounds Write

Product status

Timeline

Credits

Red Hat would like to thank The FuzzAnything Team (FuzzAnything) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-56211 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2490802 (RHBZ#2490802) issue-tracking

security.access.redhat.com/...2/vex/2026/cve-2026-56211.json

access.redhat.com/errata/RHSA-2026:30814 vendor-advisory

access.redhat.com/errata/RHSA-2026:30814 (RHSA-2026:30814) vendor-advisory

access.redhat.com/security/cve/CVE-2026-56211 vdb-entry

aomedia.googlesource.com/aom/+/a93ba0ffaa

bugzilla.redhat.com/show_bug.cgi?id=2490802 (RHBZ#2490802) issue-tracking

issues.chromium.org/issues/503993985

cve.org (CVE-2026-56211)

nvd.nist.gov (CVE-2026-56211)

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