Kludex python-multipart up to 0.0.21 Filename path traversal

Summaryinfo

A vulnerability was found in Kludex python-multipart up to 0.0.21. It has been classified as critical. Affected is an unknown function of the component Filename Handler. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-24486. Remote exploitation of the attack is possible. Furthermore, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Kludex python-multipart up to 0.0.21. It has been rated as critical. This issue affects an unknown code block of the component Filename Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-24486 since 01/23/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 296740 (Linux Distros Unpatched Vulnerability : CVE-2026-24486), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.0.22 eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (52543) and Tenable (296740). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Programming Language Software

Vendor

• Kludex

Name

• python-multipart

Version

• 0.0.1
• 0.0.2
• 0.0.3
• 0.0.4
• 0.0.5
• 0.0.6
• 0.0.7
• 0.0.8
• 0.0.9
• 0.0.10
• 0.0.11
• 0.0.12
• 0.0.13
• 0.0.14
• 0.0.15
• 0.0.16
• 0.0.17
• 0.0.18
• 0.0.19
• 0.0.20
• 0.0.21

Website

• Product: https://github.com/Kludex/python-multipart/

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CPE 2.2info

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