---
id: CVE-2026-66401
title: >-
  FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the
  UVC H.264 extension-unit parser that fails to validate descriptor length
  before accessing the GUID field
summary: >-
  FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the
  UVC H.264 extension-unit parser that fails to validate descriptor length
  before accessing the GUID field. A local attacker with a malicious USB video
  camera c…
severity: low
cvss: 2.1
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
published: '2026-08-01'
updated: '2026-08-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66401'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/5044d5390035c6fd9a36ad885192d97d21e8a92d
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8jj2-67pg-j6mg'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-uvc-h-264
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-08-02T05:17:49.328Z'
epss: 0.00201
epssPercentile: 0.08848
---

## Overview

FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can trigger a heap read beyond allocated bounds during camera stream setup, causing denial of service.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.