CVE-2026-125394 FreeRDP before 3.33.0 Use-After-Free via Stale Brush Cache Pointer

Medium 5.3 Published 9 Nov 2026 Updated 9 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125394?

CVE-2026-125394 is a medium-severity vulnerability in FreeRDP, published on 9 Nov 2026.

Official description

FreeRDP before 3.33.0 contains a heap use-after-free vulnerability in update_gdi_patblt(), update_gdi_polygon_cb() and update_gdi_mem3blt() that retain stale brush cache pointers. A malicious RDP server can resend CACHE_BRUSH to the same slot then send PATBLT, causing clients to read freed heap memory, disclosing data or crashing.

Weakness: CWE-416

Which versions are affected by CVE-2026-125394?

How do I fix CVE-2026-125394?

No fix has been published for CVE-2026-125394 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125394 being exploited?

There is no known exploitation of CVE-2026-125394 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as DEBIAN-CVE-2026-125394, GHSA-fw6x-h8gw-778w, GHSA-wc3j-h7qp-27j9, UBUNTU-CVE-2026-125394.