CVE-2026-109251
FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry
- State
- Published
- Severity
- 6.0 Medium
- Published
- Oct 12, 2026
- Updated
- Oct 18, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-129 Improper Validation of Array Index
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
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 Geometrythird-party-advisory
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