Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121400FreeRDP before 3.32.2 CPU Exhaustion via RDG Control Packet

Medium 6.5

In plain English

A medium-severity infinite loop 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 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 76.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 contains a denial-of-service vulnerability in rdg_process_control_packet that allows a malicious RD Gateway to exhaust client CPU by sending an incomplete keepalive control packet. Attackers completing the RDG tunnel-open exchange then send an eight-byte header with packetLength 0xFFFF and withhold the body, causing an unbounded no-progress read loop that spins one client thread at full CPU.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121400
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121400
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121400
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-121400
Ubuntu:24.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121400
Ubuntu:26.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121400
Ubuntu:26.10	freerdp3	no fix listed	UBUNTU-CVE-2026-121400

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

Weakness: CWE-835 · 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-x4x6-2hrm-hvq9) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 CPU Exhaustion via RDG Control Packet third-party-advisory