--- id: CVE-2026-56211 title: >- A remote code execution vulnerability was found in libaom, the reference AV1 codec implementation summary: >- 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 vide… severity: high cvss: 7.1 cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H' cwe: - CWE-787 vendor: Red Hat product: aom affected: - aom (all versions) - aom (all versions) - aom (all versions) - rhaiis/vllm-cuda-rhel9 (all versions) - rhaiis/model-opt-cuda-rhel9 (all versions) - rhaiis/vllm-rocm-rhel9 (all versions) - rhaiis/model-opt-cuda-rhel9 (all versions) - rhaiis/vllm-spyre-rhel9 (all versions) - rhaiis/vllm-rocm-rhel9 (all versions) - rhaiis/vllm-cuda-rhel9 (all versions) - aom-main (all versions) - rhai/base-image-neuron-rhel9 (all versions) - rhai/base-image-rocm-7.0-rhel9 (all versions) - rhai/base-image-cuda-13.0-rhel9 (all versions) - rhai/base-image-tpu-rhel9 (all versions) - rhai/base-image-rocm-6.4-rhel9 (all versions) - rhai/base-image-cpu-rhel9 (all versions) - rhai/base-image-spyre-rhel9 (all versions) - rhai/base-image-cuda-12.9-rhel9 (all versions) - rhoai/odh-mlserver-rhel9 (all versions) - rhoai/odh-th06-cpu-torch210-py312-rhel9 (all versions) - rhoai/odh-th06-cuda130-torch210-py312-rhel9 (all versions) - rhoai/odh-th06-rocm64-torch291-py312-rhel9 (all versions) - rhai/base-image-tpu-rhel9 (all versions) - rhai/base-image-cpu-rhel9 (all versions) - rhai/base-image-gaudi-rhel9 (all versions) - rhai/base-image-spyre-rhel9 (all versions) - rhai/base-image-rocm-7.1-rhel9 (all versions) - rhai/base-image-cuda-12.9-rhel9 (all versions) - rhai/base-image-cuda-13.0-rhel9 (all versions) - rhai/base-image-rocm-6.4-rhel9 (all versions) - rhai/base-image-neuron-rhel9 (all versions) - rhai/base-image-cpu-rhel9 (all versions) - rhai/base-image-tpu-rhel9 (all versions) - rhai/base-image-gaudi-rhel9 (all versions) - rhai/base-image-cuda-13.0-rhel9 (all versions) - rhai/base-image-rubin-rhel9 (all versions) - rhai/base-image-spyre-rhel9 (all versions) - rhai/base-image-cuda-12.9-rhel9 (all versions) - rhai/base-image-rocm-7.14-rhel9 (all versions) - rhaiis/vllm-cpu-rhel9 (all versions) - rhaiis/vllm-neuron-rhel9 (all versions) - rhaiis/vllm-tpu-rhel9 (all versions) - rhaii/vllm-cpu-rhel9 (all versions) - rhaii/vllm-gaudi-rhel9 (all versions) - rhaii/vllm-neuron-rhel9 (all versions) - rhaii/vllm-tpu-rhel9 (all versions) - firefox (all versions) - thunderbird (all versions) - firefox (all versions) patched: - enterprise_linux_ai_3_3_for_rhel 9 - enterprise_linux_ai_3_4_for_rhel 9 - enterprise_linux_ai_3_5_for_rhel 9 - ai_inference_server 3.2 - ai_inference_server 3.3 - hardened_images - openshift_ai 3.3 - openshift_ai 3.4 published: '2026-06-19' updated: '2026-09-24' sourceUpdated: '2026-09-24T09:17:07.250' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56211' references: - url: 'https://access.redhat.com/errata/RHSA-2026:30814' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:42875' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:51100' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:51146' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:60520' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61627' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61628' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61629' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68634' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68637' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68638' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68639' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68640' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68696' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68697' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68698' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68699' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68708' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68709' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68710' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69927' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69929' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69930' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69931' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69932' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69933' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69934' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69935' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71392' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71393' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71394' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71395' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71396' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71397' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71398' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71399' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71401' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-56211' label: secalert@redhat.com - url: 'https://aomedia.googlesource.com/aom/+/a93ba0ffaa' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2490802' label: secalert@redhat.com - url: 'https://issues.chromium.org/issues/503993985' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30814' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:42875' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:51100' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:51146' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:60520' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:61627' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:61628' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:61629' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-56211' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2490802' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56211.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-56211' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56211' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-06-25T03:55:28.617885Z' epss: 0.00482 epssPercentile: 0.40717 ingestedAt: '2026-06-29T13:42:11.977Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:51100** · Red Hat · fixed in: Red Hat Enterprise Linux AI 3.3 for RHEL 9 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51100) - **RHSA-2026:51146** · Red Hat · fixed in: Red Hat Enterprise Linux AI 3.4 for RHEL 9 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51146) - **RHSA-2026:42875** · Red Hat · fixed in: Red Hat Enterprise Linux AI 3.5 for RHEL 9 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:42875) - **RHSA-2026:61628** · Red Hat · fixed in: Red Hat AI Inference Server 3.2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61628) - **RHSA-2026:61627** · Red Hat · fixed in: Red Hat AI Inference Server 3.2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61627) - **RHSA-2026:61629** · Red Hat · fixed in: Red Hat AI Inference Server 3.2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61629) - **RHSA-2026:68696** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68696) - **RHSA-2026:68699** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68699) - **RHSA-2026:68698** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68698) - **RHSA-2026:68697** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68697) - **RHSA-2026:30814** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:30814) - **Red Hat VEX** · Important · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift AI (RHOAI) · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56211.json)