CVE-2026-111881

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.

Score

CVSS 3.1 7.6 High

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-10-17

Last modified

2026-10-19

Weaknesses

CWE-191

Affected products

• Freerdp (Freerdp)

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-27m7-gwhh-6hhf
• https://www.vulncheck.com/advisories/freerdp-3.14.1-before-3.32.0-integer-underflow-in-bmp-writer-via-clipboard