Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91955FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions

High 7.5

In plain English

A high-severity security flaw in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.6%top 52.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-91955
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-91955
Debian:14	freerdp3	3.31.0+dfsg-1	DEBIAN-CVE-2026-91955
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-91955
Ubuntu:24.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-91955
Ubuntu:26.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-91955

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.31.0

Weakness: CWE-369 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-4464-r7qj-pgrx) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions third-party-advisory