CVE-2026-111881 FreeRDP 3.14.1 before 3.32.0 Integer Underflow in BMP Writer via Clipboard
A malicious RDP clipboard peer can trigger an integer underflow in FreeRDP, causing a crash or out-of-bounds write via crafted BMP images.
- 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-2026-111881?
CVE-2026-111881 is a high-severity vulnerability in FreeRDP, published on 17 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 3.14.1 before 3.32.0 contains an integer underflow in the WinPR BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a crafted 1-bpp BMP processed by clipboard_synthesize_image_format_to_bmp for CF_DIB/CF_DIBV5, crashing the client or causing an out-of-bounds write.
Weakness: CWE-191
Which versions are affected by CVE-2026-111881?
How do I fix CVE-2026-111881?
Upgrade to a fixed version.
Is CVE-2026-111881 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111881 exists.
Sources
Also known as DEBIAN-CVE-2026-111881, GHSA-27m7-gwhh-6hhf, GHSA-45g6-44vr-p7wm, UBUNTU-CVE-2026-111881.