CVE-2026-91954 FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec
A malicious RDP server can crash a FreeRDP client by sending crafted Surface Bits commands, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-91954?
CVE-2026-91954 is a high-severity vulnerability in Freerdp Freerdp, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits command claiming to use NSCodec, even when the codec is disabled.
Weakness: CWE-476
Which versions are affected by CVE-2026-91954?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-91954?
Upgrade to a fixed version.
Is CVE-2026-91954 being exploited?
There is no known exploitation of CVE-2026-91954 in the wild and no public exploit code.
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-2026-91954, GHSA-32wp-qph9-89pm, GHSA-ffjr-p229-hpch, UBUNTU-CVE-2026-91954.