GHSA-3936-cmfr-pm3m
Black: Arbitrary file writes from unsanitized user input in cache file name
At a glance
- Published
- Updated
- CVE
- CVE-2026-32274
- Aliases
- PYSEC-2026-2121
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Description
### 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
| Package | Versions |
|---|---|
| PyPI · black | introduced 24.3.0, fixed 26.3.1 |
References
- https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-32274 ADVISORY
- https://github.com/psf/black/pull/4176 WEB
- https://github.com/psf/black/pull/5038 WEB
- https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d WEB
- https://github.com/psf/black/commit/ed770ba4dd50c419148a0fca2b43937a7447e1f9 WEB
- https://access.redhat.com/errata/RHSA-2026:10184 WEB
- https://access.redhat.com/errata/RHSA-2026:13545 WEB
- https://access.redhat.com/errata/RHSA-2026:13553 WEB
- https://access.redhat.com/security/cve/CVE-2026-32274 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2447111 WEB
- https://github.com/psf/black PACKAGE
- https://github.com/psf/black/releases/tag/26.3.1 WEB
- https://github.com/pypa/advisory-database/tree/main/vulns/black/PYSEC-2026-2121.yaml WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32274.json WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |