CVE-2026-91955: Freerdp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

FreeRDP before 3.31.0 fails to validate client-supplied DesktopWidth and DesktopHeight values during GCC negotiation, allowing remote attackers to crash the server. Attackers can send crafted RDP packets with zero or oversized dimensions to trigger division-by-zero or assertion failures in multifragment update capability calculations, terminating the server process.

Affected products

• Freerdp Freerdp: before 3.31.0 (fixed in 3.31.0)

Published 2026-09-15. Last modified 2026-09-24.