CVE-2026-109943 FreeRDP 3.29.0 before 3.32.0 Double Free via Async-Update Polygon Order
A malicious RDP server can crash a FreeRDP client with async-update enabled by triggering a double free in polygon order processing.
- 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-2026-109943?
CVE-2026-109943 is a high-severity use after free vulnerability in Freerdp Freerdp, published on 13 Oct 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 3.29.0 before 3.32.0 contains a double free in the client's async-update message proxy, which shallow-copies the parser-owned PolygonSC or PolygonCB points array when numPoints is zero, so both the queue consumer and parser cleanup free it. A malicious RDP server can send a point-bearing polygon order followed by a zero-point order to crash a client with +async-update enabled.
Weakness: CWE-415
Which versions are affected by CVE-2026-109943?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-109943?
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-2026-109943 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109943 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-2026-109943, GHSA-5rf6-rg39-rmc3, GHSA-pg3f-chj4-mrw6, UBUNTU-CVE-2026-109943.