# CVE-2026-56208 — Red Hat Enterprise Linux 10

> As of 2026-06-19, CVE-2026-56208 is a HIGH-severity vulnerability in Red Hat Enterprise Linux 10, CVSS v3.1 7.6. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56208 as of 2026-06-19; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-19

## What is CVE-2026-56208?

A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.

The record classifies CVE-2026-56208 under weakness class [CWE-122](https://intel.threadlinqs.com/cwe/CWE-122). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on availability. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 108 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.6 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-19

## Is CVE-2026-56208 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Red Hat](https://intel.threadlinqs.com/vendors/red-hat): Enterprise Linux 10, Enterprise Linux 9, Enterprise Linux AI (RHEL AI) 3, Hardened Images

## How to fix CVE-2026-56208

No vendor patch reference has been recorded for CVE-2026-56208 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-56208

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56208, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-20.

**Third-party advisory**

- [access.redhat.com — vdb entry](https://access.redhat.com/security/cve/CVE-2026-56208)
- [bugzilla.redhat.com — issue tracking](https://bugzilla.redhat.com/show_bug.cgi?id=2490799)

**Other references**

- [aomedia.googlesource.com](https://aomedia.googlesource.com/aom/+/243f8ae84b)
- [issues.chromium.org](https://issues.chromium.org/issues/504317456)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56208
Full detection coverage and IOCs for threats exploiting CVE-2026-56208 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp