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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-56209

Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack

No exploitation reported by the sources we read.

  • Published2026-06-19
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An arbitrary address write 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 an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.

Timeline

dates in UTC
  1. 2026-06-1916:28CVE publishedCNA

Versions per branch

Products declared by the CNA85 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

79 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-04

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • aomUbuntu:Pro:22.04:LTSall versions · fixed in 3.3.0-1ubuntu0.1+esm1
  • aomUbuntu:26.04:LTSall versions · fixed in 3.13.1-2ubuntu0.1
  • aomUbuntu:25.10all versions · no fixed version listed
  • aomUbuntu:24.04:LTSall versions · fixed in 3.8.2-2ubuntu0.2
  • aomRoot:Debian:11all versions · fixed in 1.0.0.errata1-3+deb11u2.root.io.9and 1 other package
  • aomRoot:Debian:11all versions · fixed in 1.0.0.errata1-3+deb11u2.aikido.10and 1 other package
  • aomopenEuler:24.03-LTS-SP4all versions · fixed in 3.8.0-5.oe2403sp4
  • aomopenEuler:24.03-LTS-SP3all versions · fixed in 3.8.0-6.oe2403sp3

40 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-56209 Red Hat Product Security189 products fixed · 18 known affected

    libaom: libaom: arbitrary address write via SVC layer context OOB and cyclic refresh map pointer hijack

    rhaii/model-opt-cuda-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · +15 more

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:76043 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.3.7 security update

  • RHSA-2026:76042 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.5.2 (CUDA)

  • RHSA-2026:76041 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.3.7 security update

  • RHSA-2026:75660 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.5.2 (Spyre)

39 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:84734 · 4 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  2. Vendor fix Red Hat Product Security RHSA-2026:76043 · 1 productThe container disk images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command, for use with OpenShift Virtualization. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation …
  3. Vendor fix Red Hat Product Security RHSA-2026:76042 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:76042
  4. Vendor fix Red Hat Product Security RHSA-2026:76041 · 7 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation at https://docs.redhat.com/en/documentation/…
  5. Vendor fix Red Hat Product Security RHSA-2026:75660 · 3 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:75660
  6. Vendor fix Red Hat Product Security RHSA-2026:75659 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:75659

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Published
2026-06-19
Last Modified
2026-11-04
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-8vmr-q5h8-3vc5

Frequently asked questions

What is CVE-2026-56209?

An arbitrary address write 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 an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.

Is CVE-2026-56209 actively exploited?

Active exploitation of CVE-2026-56209 has not been confirmed. Its EPSS score was 0.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-56209?

CVE-2026-56209 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.

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