CVE-2026-56211: Libaom: libaom: remote code execution via svc layer context handling with attacker-controlled frames

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-19 · updated 2026-10-19
Weakness: CWE-787

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.

Affected products

Red Hat AI Inference Server: all versions
Red Hat AI Inference Server 3.2: all versions — fixed in 1787772157, 1787860580, 1787884873
Red Hat AI Inference Server 3.3: all versions — fixed in 1789502493, 1789504371, 1789508287, 1789582776
Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 9: all versions
Red Hat Enterprise Linux AI 3.3: all versions — fixed in 1790791893, 1790850900, 1790866732, 1790936334, 1790936351, 1790954179
Red Hat Enterprise Linux AI 3.3 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Enterprise Linux AI 3.4 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Enterprise Linux AI 3.5 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Hardened Images: all versions — fixed in 3.14.0-0.1.hum1
Red Hat OpenShift AI 3.3: all versions — fixed in 1789137548, 1789137552, 1789137607, 1789137636, 1789137641
Red Hat OpenShift AI 3.4: all versions — fixed in 1786611800, 1787076481, 1787076778, 1787077779, 1788197530, 1788197549
Red Hat OpenShift AI 3.5: all versions — fixed in 1788197385, 1788197492, 1788197512, 1788197542, 1788197688, 1788197975

How to fix

Upgrade to a fixed version: Red Hat AI Inference Server 3.2 1787772157, 1787860580, 1787884873; Red Hat AI Inference Server 3.3 1789502493, 1789504371, 1789508287, 1789582776; Red Hat Enterprise Linux AI 3.3 1790791893, 1790850900, 1790866732, 1790936334; Red Hat Enterprise Linux AI 3.3 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Enterprise Linux AI 3.4 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Enterprise Linux AI 3.5 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Hardened Images 3.14.0-0.1.hum1; Red Hat OpenShift AI 3.3 1789137548, 1789137552, 1789137607, 1789137636; Red Hat OpenShift AI 3.4 1786611800, 1787076481, 1787076778, 1787077779; Red Hat OpenShift AI 3.5 1788197385, 1788197492, 1788197512, 1788197542. Check the vendor advisory for mitigations.

References

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