SB2026022322 - Improper Handling of Windows Device Names in Werkzeug
Published: February 23, 2026
Security Bulletin ID
SB2026022322
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Handling of Windows Device Names (CVE-ID: CVE-2026-27199)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the "safe_join" function allows Windows device names as filenames if when preceded by other path segments. A remote attacker can cause reading of the file to hang indefinitely.
Remediation
Install update from vendor's website.