CVE-2026-111880 FreeRDP 2.0.0 before 3.32.0 Heap Out-of-Bounds Write via NTLM MIC Offset
Unauthenticated attackers can trigger a heap out-of-bounds write in FreeRDP via crafted NTLM messages, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-111880?
CVE-2026-111880 is a high-severity memory corruption vulnerability in FreeRDP, published on 17 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
FreeRDP versions from 2.0.0 before 3.32.0 contain a heap out-of-bounds write in the server hash-callback NTLM path that fails to validate the MIC offset. Unauthenticated attackers can send a crafted AUTHENTICATE_MESSAGE with a backward session-key offset and MIC offset to write 16 zero bytes beyond the allocation.
Weakness: CWE-787
Which versions are affected by CVE-2026-111880?
How do I fix CVE-2026-111880?
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-2026-111880 being exploited?
There is no known exploitation of CVE-2026-111880 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-111880, GHSA-98x3-97xw-cfqr, GHSA-cmgx-558f-vh67, UBUNTU-CVE-2026-111880.