CVE-2026-109257 FreeRDP before 3.32.0 Double Free via NSCodec plane growth failure
Attackers can crash the FreeRDP server by triggering a double-free error during NSCodec initialization with crafted geometry.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-109257?
CVE-2026-109257 is a high-severity use after free vulnerability in Freerdp Freerdp, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial buffer growth failure. Attackers using a crafted RDP client can negotiate NSCodec with a large desktop geometry to trigger allocation failure, crashing the server during context teardown.
Weakness: CWE-415
Which versions are affected by CVE-2026-109257?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-109257?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-109257 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109257 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-2026-109257, GHSA-2hhg-8xx6-v73w, GHSA-q56w-xxg8-3cmg, UBUNTU-CVE-2026-109257.