CVE-2026-32274
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Python Black
PublishedMar 12, 2026
First seenMar 12, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- python black26.3.1 or later
- black26.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python black | v < 26.3.1 | 26.3.1 |
| blackPyPI | 24.3.0 ≤ v < 26.3.1, v < 26.3.1 | 26.3.1 |
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