CVE-2026-91947 FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC
Authenticated clients can trigger a use-after-free in FreeRDP server via race conditions, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-91947?
CVE-2026-91947 is a high-severity use after free vulnerability in FreeRDP, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free when accessing freed channel objects.
Weakness: CWE-362
Which versions are affected by CVE-2026-91947?
How do I fix CVE-2026-91947?
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-2026-91947 being exploited?
There is no known exploitation of CVE-2026-91947 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91947, GHSA-6mpx-c8rj-whj5, GHSA-chpg-x28q-pmrg, UBUNTU-CVE-2026-91947.