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CVE-2026-102598 Details

Description

Werkzeug is a comprehensive WSGI web application library. Prior to 3.1.9, the safe_join function used by send_from_directory can allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty NTFS ADS marker. The trigger is that an application runs on Windows with NTFS and serves a user-specified path ending in a special device name such as NUL:. The attack mechanism is that a requested path ends in a Windows special device name with an empty ADS marker. The impact is that the special device opens successfully and the file read hangs indefinitely. This issue is fixed in version 3.1.9.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/pallets/werkzeug/commit/8d77320bcdf3a34941ec06dcf16b03c065cd21b6	[email protected]
https://github.com/pallets/werkzeug/pull/3309	[email protected]
https://github.com/pallets/werkzeug/releases/tag/3.1.9	[email protected]
https://github.com/pallets/werkzeug/security/advisories/GHSA-g6x2-hccm-hh4m	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-67	Improper Handling of Windows Device Names	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 29, 2026	New CVE Received	[email protected]
Sep 29, 2026	CVE Modified	CISA-ADP