CVE-2026-121957

FreeRDP before 3.32.2 contains a use-after-free vulnerability that allows malicious RDP servers to corrupt client memory by racing the RDPGFX ResetGraphics handler against the planar bitmap decoder. Attackers can send ResetGraphics while concurrently sending compressed bitmaps of 32 bpp or more to trigger heap use-after-free or out-of-bounds read/write on shared planar buffers.

• CWE-362

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xjhw-2r55-m95gExploit, Mitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-rdpgfx-resetgraphics-raceThird Party Advisory
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xjhw-2r55-m95gExploit, Mitigation, Vendor Advisory

Published

Nov 4, 2026

Last Modified

Nov 5, 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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