CVE-2026-40254

FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in `channels/drive/client/drive_file.c`. The `contains_dotdot()` function catches `../` and `..\` mid-path but misses `..` when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.

• CWE-193

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmxExploit, Mitigation, Vendor Advisory
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmxExploit, Mitigation, Vendor Advisory

Published

Apr 24, 2026

Last Modified

Jun 17, 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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