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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99adb Patch
- https://github.com/FreeRDP/FreeRDP/pull/12873 Issue Tracking, Patch
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6 Exploit, Mitigation, Vendor Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6 Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.2 · freerdpNVD modified 2026-10-26 11:10
Affected (CPE criteria) 1
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
References 5
- https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99adb Patch
- https://github.com/FreeRDP/FreeRDP/pull/12873 Issue Tracking, Patch
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 Release Notes
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6 Exploit, Mitigation, Vendor Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6 Exploit, Mitigation, Vendor Advisory