Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck

CVE-2026-121951FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event

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 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 63.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP 3.0.0 before 3.32.2 server-side RDP peer input parsing skips the six-byte body of a slow-path input event with an unknown message type without checking it lies within the packet's declared length, causing a WinPR stream assertion failure. A remote RDP client with an active session can send a truncated unknown input event to abort assertion-enabled server processes, causing denial of service.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121951
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121951
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121951

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	3.0.0 – before 3.32.2

Weakness: CWE-617 · 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-4qq4-qwxq-49m8) vendor-advisory
VulnCheck Advisory: FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event third-party-advisory