CVE-2026-66401 FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264
A local attacker with a malicious USB camera can cause a denial of service in FreeRDP via an out-of-bounds heap read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-66401?
CVE-2026-66401 is a low-severity memory corruption vulnerability in Freerdp Freerdp, published on 1 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-66401?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-66401?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-66401 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66401 exists.
Other vulnerabilities in Freerdp Freerdp
- CVE-2021-37594 Other in n/a
- CVE-2021-37595 Other in n/a
- CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
- CVE-2026-66402 FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
- CVE-2026-67289 FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
Sources
Also known as DEBIAN-CVE-2026-66401, GHSA-8jj2-67pg-j6mg, GHSA-j96g-x36f-4cg4, UBUNTU-CVE-2026-66401.