Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121406FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload

Medium 4.3

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 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 85.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 allows a client assertion abort because rdpgfx_on_data_received rejects only negative zgfx_decompress status and passes the resulting null output pointer to Stream_StaticConstInit. A malicious RDP server can send a zero-output ZGFX payload on the RDPGFX channel after session activation to terminate the client.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121406
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121406
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121406
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-121406
Ubuntu:24.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121406
Ubuntu:26.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121406
Ubuntu:26.10	freerdp3	no fix listed	UBUNTU-CVE-2026-121406

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

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

References

GitHub Security Advisory (GHSA-2c9x-4gr7-hrwx) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload third-party-advisory