CVE-2026-91964: Freerdp

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.

Affected products

• Freerdp Freerdp: from 2.0.0, before 3.0.0 (fixed in 3.0.0); from 3.0.0, before 3.31.0 (fixed in 3.31.0); before 3.31.0 (fixed in 3.31.0)

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