Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck
CVE-2026-66401FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264
Low 2.1
In plain English
A low-severity out-of-bounds read in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-66401 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-66401 |
| Debian:14 | freerdp3 | 3.29.0+dfsg-1 | DEBIAN-CVE-2026-66401 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-66401 |
| Ubuntu:24.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-66401 |
| Ubuntu:26.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-66401 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
References
- GitHub Security Advisory (GHSA-8jj2-67pg-j6mg) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264 third-party-advisory