FreeRDP heap UAF in serial channel IRP tracking (pre 3.20.1)
CVE-2026-22856 Published on January 14, 2026
FreeRDP has a heap-use-after-free in create_irp_thread
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial channel IRP thread tracking allows a heap useafterfree when one thread removes an entry from serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1.
Weakness Types
What is a Race Condition Vulnerability?
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.
CVE-2026-22856 has been classified to as a Race Condition vulnerability or weakness.
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-22856 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-22856
Want to know whenever a new CVE is published for FreeRDP? stack.watch will email you.
Affected Versions
FreeRDP Version < 3.20.1 is affected by CVE-2026-22856Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.