Vulnerability in Freerdp
CVE-2026-109251
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-grvc-qhhp-7h6m (vendor-advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.0-out-of-bounds-write-via-ms-r… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109251?
- CVE-2026-109251 is a medium-severity vulnerability in Freerdp, classified under Improper Validation of Array Index. CVSS score: 5.3/10. Published 2026-10-12.
- How severe is CVE-2026-109251?
- Medium severity. CVSS v3 base score is 5.3 out of 10.