# CVE-2026-56210 — Red Hat Enterprise Linux 10

> As of 2026-06-19, CVE-2026-56210 is a HIGH-severity vulnerability in Red Hat Enterprise Linux 10, CVSS v3.1 7.1. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56210 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-2026-56210?

A heap-buffer-overflow read 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 setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory).

The record classifies CVE-2026-56210 under weakness class [CWE-125](https://intel.threadlinqs.com/cwe/CWE-125). 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:** 7.1 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-19

## Is CVE-2026-56210 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-2026-56210

No vendor patch reference has been recorded for CVE-2026-56210 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-2026-56210

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56210, 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-2026-56210)
- [bugzilla.redhat.com — issue tracking](https://bugzilla.redhat.com/show_bug.cgi?id=2490801)

**Other references**

- [aomedia.googlesource.com](https://aomedia.googlesource.com/aom/+/a93ba0ffaa)
- [issues.chromium.org](https://issues.chromium.org/issues/503975732)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56210
Full detection coverage and IOCs for threats exploiting CVE-2026-56210 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp