VDB
CVE-2026-55192
CVE-2026-55192
PUBLISHED
CVSS 7.2 HIGH
Reported by GitHub_M · Published August 19, 2026
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP H.264 decoder backends can return YUV planes sized from the bitstream without comparing the decoded width and height to the RDPGFX surface dimensions used to validate region rectangles. A malicious RDP server can provide an AVC420 or AVC444 bitstream whose decoded frame is smaller than the negotiated surface, causing yuv420_context_decode and the YUV-to-RGB conversion paths to read beyond the decoder-owned planes in libfreerdp/codec/h264.c and the selected H.264 backend. This can disclose client memory or crash the client. This issue is fixed in version 3.27.0.
Risk Scores
CVSS 4.0
7.2
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| FreeRDP | FreeRDP | < 3.27.0 |
| FreeRDP | FreeRDP | < 3.27.0, < 3.27.0 |
| alpine | freerdp | 0, 0, 0 |
Timeline
- Jun 19, 2026 CVE Published
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 4, 2026 Security Advisory
- Sep 6, 2026 EPSS Score
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6 x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/pull/12873 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99adb x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 x_refsource_MISC