Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121407FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel

Medium 6.5

In plain English

A medium-severity improper input validation 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 75.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server's remdesk_server_thread that allows authenticated clients to crash the process via an inverted PDU length check. Attackers can send an 8192-byte remdesk payload declaring an eight-byte PDU length to trigger a fatal Stream_Seek assertion, aborting the server and dropping sessions.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121407
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121407
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121407
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-121407
Ubuntu:24.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121407
Ubuntu:26.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121407
Ubuntu:26.10	freerdp3	no fix listed	UBUNTU-CVE-2026-121407

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-x8vp-ff7m-294g) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel third-party-advisory