high7.5
CVE-2026-32274
Black: Arbitrary file writes from unsanitized user input in cache file name
Impact
### Impact 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. ### Patches Fixed in Black 26.3.1. ### Workarounds Do not allow untrusted user input into the value of the `--python-cell-magics` option.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | black | >= 24.3.0, < 26.3.1 | 26.3.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Black | before 26.3.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:13553
- https://access.redhat.com/security/cve/CVE-2026-32274
- https://bugzilla.redhat.com/show_bug.cgi?id=2447111
- https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d
- https://github.com/psf/black/commit/ed770ba4dd50c419148a0fca2b43937a7447e1f9
- https://github.com/psf/black/pull/4176
- https://github.com/psf/black/pull/5038
- https://github.com/psf/black/releases/tag/26.3.1
- https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m
- https://github.com/pypa/advisory-database/tree/main/vulns/black/PYSEC-2026-2121.yaml
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32274.json
- https://github.com/advisories/GHSA-3936-cmfr-pm3m
- https://nvd.nist.gov/vuln/detail/CVE-2026-32274