CVE-2026-55192

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.

• CWE-125

• https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99adbPatch
• https://github.com/FreeRDP/FreeRDP/pull/12873Issue Tracking, Patch
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0Release Notes
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6Exploit, Mitigation, Vendor Advisory
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6Exploit, Mitigation, Vendor Advisory

Published

Aug 19, 2026

Last Modified

Sep 22, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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