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CVE-2026-56209

7.1 · HIGH

An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation.

Published Jun 19, 2026CWE-787EPSS 0.64%

Overview

CVE-2026-56209 is a high-severity vulnerability. It was published on June 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:30814Refaccess.redhat.com/errata/RHSA-2026:42875Refaccess.redhat.com/errata/RHSA-2026:51100Refaccess.redhat.com/errata/RHSA-2026:51146Refaccess.redhat.com/errata/RHSA-2026:60520Refaccess.redhat.com/security/cve/CVE-2026-56209Refaomedia.googlesource.com/aom/+/a93ba0ffaaRefbugzilla.redhat.com/show_bug.cgi?id=2490800Refissues.chromium.org/issues/503993984Refaccess.redhat.com/errata/RHSA-2026:30814

How CyberStrike helps

Frequently asked questions

What is CVE-2026-56209?

CVE-2026-56209 is a high-severity vulnerability. It was published on June 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-56209?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-56209?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-56209?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-56209 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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