Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freerdp | Freerdp | < 3.25.0 |
Related Weaknesses (CWE)
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmxExploitMitigationVendor Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmxExploitMitigationVendor Advisory
FAQ
What is CVE-2026-40254?
CVE-2026-40254 is a vulnerability with a CVSS score of 4.2 (MEDIUM). 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(...
How severe is CVE-2026-40254?
CVE-2026-40254 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40254?
Check the references section above for vendor advisories and patch information. Affected products include: Freerdp Freerdp.