CVE-2026-32274

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32274.json

https://github.com/pypa/advisory-database/tree/main/vulns/black/PYSEC-2026-2121.yaml

https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m

https://github.com/psf/black/releases/tag/26.3.1

https://github.com/psf/black/pull/5038

https://github.com/psf/black/pull/4176

https://github.com/psf/black/commit/ed770ba4dd50c419148a0fca2b43937a7447e1f9

https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d

https://bugzilla.redhat.com/show_bug.cgi?id=2447111

https://access.redhat.com/security/cve/CVE-2026-32274

https://access.redhat.com/errata/RHSA-2026:13553

https://access.redhat.com/errata/RHSA-2026:13545

https://access.redhat.com/errata/RHSA-2026:10184

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS