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CVE-2026-40254

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

Published: Apr 24, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-193
NVD MITRE
4.2CVSSMEDIUM
EPSS Score
0.2%
Top 95.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-193

Affected Products

freerdpfreerdpOSS Libraries
FreeRDPFreeRDPOSS Libraries
freerdposs-projectUSOSS Libraries

Exploitability

Workaround Available

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmx
github.com

Timeline

Published
Apr 24, 2026
Last Updated
Apr 27, 2026

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