Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91961FreeRDP before 3.31.0 Denial of Service via URBDRC

Medium 6.5

In plain English

A medium-severity security flaw in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 68.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-91961
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-91961
Debian:14	freerdp3	3.31.0+dfsg-1	DEBIAN-CVE-2026-91961
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-91961
Ubuntu:24.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-91961
Ubuntu:26.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-91961

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.31.0

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-w9qg-g24r-77f6) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.31.0 Denial of Service via URBDRC third-party-advisory