Medium severity · published Oct 12, 2026
CVE-2026-109251
FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
before 3.32.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109251
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109251
vendor-advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-grvc-qhhp-7h6m
third-party-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.0-out-of-bounds-write-via-ms-rdpegt-video-geometry
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