CVE-2026-32274 — Black: Arbitrary file writes from unsanitized user input in cache file name

Description (CNA)

Black is the uncompromising Python code formatter. Starting in version 24.3.0 and prior to version 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.

Affected (CNA)

Vendor / product	Versions
psf / black	affected >= 24.3.0, < 26.3.1

CWE

CWE-22

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A user input sanitization flaw has been discovered in the Black python code formatter. 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.