Off-by-one Error Affecting freerdp-devel package, versions <2:3.6.3-1.amzn2023.0.11


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-AMZN2023-FREERDPDEVEL-16709939
  • published16 May 2026
  • disclosed24 Apr 2026

Introduced: 24 Apr 2026

NewCVE-2026-40254  (opens in a new tab)
CWE-193  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 freerdp-devel to version 2:3.6.3-1.amzn2023.0.11 or higher.
This issue was patched in ALAS2023-2026-1643.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp-devel package and not the freerdp-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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 Base Scores

version 3.1