CVE-2026-91960

Description

FreeRDP versions before 3.31.0 contain an integer overflow in WinPR's Stream_EnsureRemainingCapacity function that allows remote attackers to cause denial of service. A malicious RD Gateway peer can send a WebSocket Ping frame with a crafted 64-bit extended payload length to trigger integer wraparound, resulting in a double free that crashes the FreeRDP client during connection.

CVSS Vector

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf
• https://www.vulncheck.com/advisories/freerdp-before-3.31.0-integer-overflow-double-free
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf