zauberzeug NiceGUI up to 3.6.x path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in zauberzeug NiceGUI up to 3.6.x. Affected is an unknown function. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-25732. The attack may be launched remotely. Furthermore, there is an exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in zauberzeug NiceGUI up to 3.6.x and classified as critical. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect integrity, and availability. CVE summarizes:

NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use the pattern UPLOAD_DIR / file.name. Malicious filenames containing ../ sequences allow attackers to write files outside intended directories, with potential for remote code execution through application file overwrites in vulnerable deployment patterns. This design creates a prevalent security footgun affecting applications following common community patterns. Note: Exploitation requires application code incorporating file.name into filesystem paths without sanitization. Applications using fixed paths, generated filenames, or explicit sanitization are not affected. This vulnerability is fixed in 3.7.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-25732 since 02/05/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

Upgrading to version 3.7.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (52534) and EUVD (EUVD-2026-5568). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• zauberzeug

Name

• NiceGUI

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6

Website

• Product: https://github.com/zauberzeug/nicegui/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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