Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121409FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token

Medium 5.9

In plain English

A medium-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 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 73.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 contains a denial of service vulnerability that allows malicious servers or unauthenticated peers to abort clients or proxies via oversized X.224 routing tokens. Attackers can send an oversized LoadBalanceInfo in a Server Redirection PDU, or a 240–247 byte token to a FixedTarget freerdp-proxy, triggering a tpdu_write_header assertion that crashes the process.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121409
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121409
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121409
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-121409
Ubuntu:24.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121409
Ubuntu:26.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121409
Ubuntu:26.10	freerdp3	no fix listed	UBUNTU-CVE-2026-121409

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

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

References

GitHub Security Advisory (GHSA-3hf9-w6hr-hf9j) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token third-party-advisory