What is CVE-2026-40254?

CVE-2026-40254 is a medium-severity vulnerability in Freerdp, classified under Off-by-one Error. CVSS score: 4.2/10. Published 2026-04-24.

How severe is CVE-2026-40254?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Freerdp

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…

EPSS: 0.001 (17.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Freerdp — versions < 3.25.0

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

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

Frequently asked questions

What is CVE-2026-40254?: CVE-2026-40254 is a medium-severity vulnerability in Freerdp, classified under Off-by-one Error. CVSS score: 4.2/10. Published 2026-04-24.
How severe is CVE-2026-40254?: Medium severity. CVSS v3 base score is 4.2 out of 10.