CVE-2026-40254CWE-193

FreeRDP: contains_dotdot() off-by-one allows drive channel path traversal via terminal ..

Medium · published April 24, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
12.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00228 · 12.8th percentile
Weakness
CWE-193 · Off-by-one Error
Published
2026-04-24T02:24Z
EPSS history
Timeline
  • 24 APR 02:24Z
    FreeRDP: contains_dotdot() off-by-one allows drive channel path traversal via terminal ..
    cvelistv5