Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99a
- https://github.com/FreeRDP/FreeRDP/pull/12873
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6
FAQ
What is CVE-2026-55192?
CVE-2026-55192 is a documented vulnerability. 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 ...
How severe is CVE-2026-55192?
CVSS scoring is not yet available for CVE-2026-55192. Check NVD for updates.
Is there a patch for CVE-2026-55192?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.