Is CVE-2026-40254 actively exploited?

No active exploitation of CVE-2026-40254 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40254 be exploited remotely?

Yes. CVE-2026-40254 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40254?

CVE-2026-40254 has a CVSS score of 6.1 (MEDIUM).

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MEDIUM

CVE-2026-40254

CWE-193Published: April 24, 2026· Updated: Apr 27, 2026

6.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40254 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.