CVE-2026-91959 FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway
Attackers can cause a denial of service in FreeRDP by sending a malicious BIND_ACK PDU that triggers a buffer over-read in the RPC gateway parser.
- 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-2026-91959?
CVE-2026-91959 is a high-severity memory corruption 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 before 3.31.0 contains a buffer over-read vulnerability in the rts_read_result function within the RPC gateway transport parser. Attackers can send a malicious BIND_ACK PDU with a truncated result entry to trigger an out-of-bounds read causing process abort.
Weakness: CWE-125
Which versions are affected by CVE-2026-91959?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-91959?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-91959 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91959 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-2026-91959, GHSA-c7qq-9mg2-ccx2, GHSA-pj8w-fh79-f438, UBUNTU-CVE-2026-91959.