CVE-2026-27199 (Medium) detected in Werkzeug-1.0.1-py2.py3-none-any.whl #137
Description
CVE-2026-27199 - Medium Severity Vulnerability
Vulnerable Library - Werkzeug-1.0.1-py2.py3-none-any.whl
The comprehensive WSGI web application library.
Library home page: https://files.pythonhosted.org/packages/cc/94/5f7079a0e00bd6863ef8f1da638721e9da21e5bacee597595b318f71d62e/Werkzeug-1.0.1-py2.py3-none-any.whl
Path to dependency file: /day70/requirements.txt
Path to vulnerable library: /day70/requirements.txt,/day70/requirements.txt
Dependency Hierarchy:
- ❌ Werkzeug-1.0.1-py2.py3-none-any.whl (Vulnerable Library)
Found in HEAD commit: c88b9429eb68a85b22f0e39cac7bf20b89cb6709
Found in base branch: master
Vulnerability Details
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.
Publish Date: 2026-02-21
URL: CVE-2026-27199
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
Suggested Fix
Type: Upgrade version
Release Date: 2026-02-21
Fix Resolution: werkzeug - 3.1.6,https://github.com/pallets/werkzeug.git - 3.1.6
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