High 8.7Published Mar 12, 2026

CVE-2026-32274Black: Arbitrary file writes from unsanitized user input in cache file name

Updated under an hour ago (Oct 27, 2026, 5:10 AM ET)

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It affects psf black and 6 other products. Add what you run to find out whether that includes you.

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Every CVE for psf black

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Aug 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

psf black psf:black (from the name)	from 24.3.0, < 26.3.1	CNA record
Red Hat Red Hat Ansible Automation Platform 2.5 redhat:ansible_automation_platform	from 1777393635 not affected	CISA ADP
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1776319193 not affected	CISA ADP
Red Hat OpenShift Lightspeed redhat:openshift_lightspeed	All versions	CISA ADP
Red Hat Red Hat Ansible Automation Platform Ansible Core 2 redhat:ansible_core	2	CISA ADP
Red Hat Red Hat OpenShift Virtualization 4 redhat:container_native_virtualization	4	CISA ADP
python black python:black	before 26.3.1	NVD

References

References

https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m	x-refsource-confirm, vendor-advisory
https://github.com/psf/black/pull/4176	x-refsource-misc
https://github.com/psf/black/pull/5038	x-refsource-misc, issue-tracking, patch
https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d	x-refsource-misc, patch
https://github.com/psf/black/commit/ed770ba4dd50c419148a0fca2b43937a7447e1f9	x-refsource-misc
https://access.redhat.com/errata/RHSA-2026:10184	x-refsource-misc
https://access.redhat.com/errata/RHSA-2026:13545	x-refsource-misc
https://access.redhat.com/errata/RHSA-2026:13553	x-refsource-misc
https://access.redhat.com/security/cve/CVE-2026-32274	x-refsource-misc
https://bugzilla.redhat.com/show_bug.cgi?id=2447111	x-refsource-misc
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.