Improper Handling of Windows Device Names Affecting litellm package, versions <1.81.12.1-r0


Severity

Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.03% (8th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-CHAINGUARDLATEST-LITELLM-15357601
  • published26 Feb 2026
  • disclosed21 Feb 2026

Introduced: 21 Feb 2026

CVE-2026-27199  (opens in a new tab)
CWE-67  (opens in a new tab)

How to fix?

Upgrade Chainguard litellm to version 1.81.12.1-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream litellm package and not the litellm package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Werkzeug is a comprehensive WSGI web application library. Versions 3.1.5 and below, the safe_join function allows Windows device names as filenames if preceded by other path segments. This was previously reported as GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL. The function send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely. This issue has been fixed in version 3.1.6.

CVSS Base Scores

version 3.1