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Werkzeug safe_join() allows Windows special device names

🗓️ 02 Dec 2025 00:27:38Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 15 Views

On Windows, safe_join allows device names like CON and can hang when serving files with send_from_directory.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Security vulnerability in Python affects IBM Robotic Process Automation
23 Mar 202613:42
–ibm
IBM Security Bulletins		Security Bulletin: Vulnerability in Werkzeug affects IBM Netezza Appliance
15 Apr 202611:36
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite uses werkzeug-3.1.3,fonttools-4.60.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.whl,lodash.clonedeep-4.5.0.tgz,js-yaml-4.1.0.tgz,mdast-util-towhich is vulnerable to multiple CVEs
30 Jan 202605:39
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Visual Inspection component uses werkzeug-3.1.3-py3-none-any.whl which is vulnerable to CVE-2025-66221
2 Mar 202609:20
–ibm
IBM Security Bulletins		Security Bulletin: Investigation Assistant App for IBM QRadar SIEM is vulnerable to using components with known vulnerabilities
26 Feb 202601:05
–ibm
IBM Security Bulletins		Security Bulletin: There is a vulnerability in werkzeug-3.1.3-py3-none-any.whl used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2025-66221)
2 Feb 202612:50
–ibm
IBM Security Bulletins		Security Bulletin: IBM InfoSphere Information Server is affected by multiple vulnerabilities in Werkzeug
2 Feb 202619:09
–ibm
IBM Security Bulletins		Security Bulletin: User Entity Behavior Analytics App for IBM QRadar SIEM is vulnerable to using components with known vulnerabilities
28 Jan 202615:35
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite uses multiple third party dependencies which are vulnerable to CVEs.
29 Dec 202505:42
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Predict Component was using vulnerable library werkzeug-3.1.3 which is vulnerable to CVE-2025-66221
24 Mar 202607:11
–ibm
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Vulners
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palletsprojectswerkzeugRange<3.1.4pip

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02 Dec 2025 00:27Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.15.3
CVSS 46.3
EPSS0.00032
SSVC
CWE-67
WindowsSafe joinDevice namesSpecial device namesSend from directory
15