Integer overflow in FreeRDP - CVE-2026-91960
Published: September 1, 2026 / Updated: September 16, 2026
Vulnerability identifier: #VU146595
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-91960
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow or wraparound in Stream_EnsureCapacity and Stream_EnsureRemainingCapacity when processing a crafted WebSocket frame length from an RD Gateway peer. A remote attacker can send a specially crafted WebSocket Ping frame to cause a denial of service.
User interaction is required because the victim must be induced to connect through the attacker's RD Gateway, such as via a supplied .rdp file.
Affected software
FreeRDP
How to mitigate CVE-2026-91960
Install security update from vendor's website.
FreeRDP - update to 3.31.0