CVE-2026-109941 FreeRDP 2.3.0 before 3.32.0 Infinite Loop via RD Gateway Chunked Response
A malicious RD Gateway can cause FreeRDP clients to hang indefinitely by sending incomplete chunked responses, freezing the decoder thread.
- 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-2026-109941?
CVE-2026-109941 is a high-severity denial of service 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 from 2.3.0 before 3.32.0 contains an infinite loop vulnerability in http_chuncked_read that allows malicious RD Gateways to hang clients by sending incomplete chunked responses. Attackers can send a partial chunk-size line or footer followed by a clean TLS shutdown, causing zero-byte reads to loop forever and freeze the client decoder thread.
Weakness: CWE-835
Which versions are affected by CVE-2026-109941?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-109941?
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-2026-109941 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109941 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-2026-109941, GHSA-26h4-ghv8-j876, GHSA-7vfc-chg9-q5r8, UBUNTU-CVE-2026-109941.