Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109251FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry

Medium 5.3

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 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 78.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.0 stores the server-supplied signed MS-RDPEGT geometry origin unchecked in an unsigned video surface coordinate, so the blit clamp in gdiVideoShowSurface() wraps in 32-bit arithmetic and is skipped. A malicious RDP server can send a negative topLevelLeft to clients connecting with /video, causing an out-of-bounds write of decoded H.264 picture data or a client abort.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-109251
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-109251
Debian:14	freerdp3	3.32.0+dfsg-1	DEBIAN-CVE-2026-109251
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-109251
Ubuntu:24.04:LTS	freerdp3	3.32.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-109251
Ubuntu:26.04:LTS	freerdp3	3.32.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-109251

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.0

Weakness: CWE-129 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-grvc-qhhp-7h6m) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry third-party-advisory