psf black up to 26.3.0 path traversal

Summaryinfo

A vulnerability labeled as critical has been found in psf black up to 26.3.0. The affected element is an unknown function. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-32274. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in psf black up to 26.3.0 and classified as critical. This vulnerability affects an unknown part. 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:

Black is the uncompromising Python code formatter. Prior to 26.3.1, Black writes a cache file, the name of which is computed from various formatting options. The value of the --python-cell-magics option was placed in the filename without sanitization, which allowed an attacker who controls the value of this argument to write cache files to arbitrary file system locations. Fixed in Black 26.3.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-32274 since 03/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability scanner Nessus provides a plugin with the ID 302172 (Linux Distros Unpatched Vulnerability : CVE-2026-32274), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.3.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 4937fe6cf241139ddbfc16b0bdbb5b422798909d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (302172). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• psf

Name

• black

Version

• 26.0
• 26.1
• 26.2
• 26.3.0

License

• open-source

Website

• Product: https://github.com/psf/black/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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