What’s Vulnerable › Vulnerabilities

CVE-2026-66401: FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

• Severity: low (CVSS 2.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-01 · updated 2026-09-03
• Weakness: CWE-125

Description

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.

Affected products

• FreeRDP: before 3.29.0 — fixed in 3.29.0

How to fix

Upgrade to a fixed version: FreeRDP 3.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/5044d5390035c6fd9a36ad885192d97d21e8a92d
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8jj2-67pg-j6mg
• https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-uvc-h-264
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8jj2-67pg-j6mg

Get alerted when CVE-2026-66401 or the next vulnerability affects your stack