SB2026010911 - Improper Handling of Windows Device Names in Werkzeug
Published: January 9, 2026
Security Bulletin ID
SB2026010911
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Handling of Windows Device Names (CVE-ID: N/A)
CWE-ID: CWE-67 - Improper Handling of Windows Device Names
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the "safe_join" function allows path segments with Windows device names that have file extensions or trailing spaces. A remote attacker can cause reading of the file to hang indefinitely.
Remediation
Install update from vendor's website.