CVE-2026-56211

7.1 HIGH 0.9% exploit odds No fix listed Memory safety

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. High risk of data tampering, service disruption.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-06-19 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-11-04 23:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 7.1 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2026-06-19 17:16 UTC
Last modified: 2026-11-04 23:17 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Awaiting Analysis

Attack profile CVSS 3.1 · 7.1

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H

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References

NVD record · CVE.org record