CVE-2026-32274: Black: Arbitrary file writes from unsanitized user input in cache file name
(updated )
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.
References
- access.redhat.com/errata/RHSA-2026:10184
- access.redhat.com/errata/RHSA-2026:13545
- access.redhat.com/errata/RHSA-2026:13553
- access.redhat.com/security/cve/CVE-2026-32274
- bugzilla.redhat.com/show_bug.cgi?id=2447111
- github.com/advisories/GHSA-3936-cmfr-pm3m
- github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d
- github.com/psf/black/commit/ed770ba4dd50c419148a0fca2b43937a7447e1f9
- github.com/psf/black/pull/4176
- github.com/psf/black/pull/5038
- github.com/psf/black/releases/tag/26.3.1
- github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m
- github.com/pypa/advisory-database/tree/main/vulns/black/PYSEC-2026-2121.yaml
- nvd.nist.gov/vuln/detail/CVE-2026-32274
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32274.json
Code Behaviors & Features
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