CVE-2026-91952 FreeRDP before 3.31.0 Denial of Service via pool_decode_rect
A malicious RDP server can cause a denial of service in FreeRDP clients by triggering an infinite loop during graphics decoding.
- 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-2026-91952?
CVE-2026-91952 is a high-severity denial of service 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 versions before 3.31.0 contain an infinite-loop denial of service in the pool_decode_rect function when decoding AVC444 metablocks with more region rectangles than preallocated worker array size. A malicious RDP server can send crafted AVC444 graphics updates causing the threaded decode path to loop indefinitely, consuming CPU and preventing normal client operation.
Weakness: CWE-835
Which versions are affected by CVE-2026-91952?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-91952?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-91952 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91952 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-2026-91952, GHSA-2f6r-w7g3-4q27, GHSA-m85m-3qxv-63h5, UBUNTU-CVE-2026-91952.