CVE-2026-121411

FreeRDP before 3.32.2 fails to bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs, allowing malicious RDP servers to abort X11 clients. Attackers can map a surface to oversized scaled output, triggering checked UINT16 cast or freerdp_image_scale stride assertion failures that terminate the client.

• CWE-20

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wffv-rjv2-h2x2Vendor Advisory
• https://www.vulncheck.com/advisories/freerdp-before-3.32.2-x11-client-abort-via-rdpgfx-scaled-output-geometryThird Party Advisory

Published

Nov 3, 2026

Last Modified

Nov 3, 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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