Black is the uncompromising Python code formatter. Prior to 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.
CVE-2026-32274
HIGHNVD 7.57.5
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(low)
- EPSS
- 43.1%
- KEV
- Not listed
Published
March 12, 2026
Last Modified
June 30, 2026
Advisory Details (10)
Auto-updated Jul 3, 2026Patch available. Sources: github_commit, github_pr, github_release, github, redhat.
redhat
2447111 – (CVE-2026-32274) CVE-2026-32274 black: Black: Arbitrary file writes from unsanitized user input in cache file name
https://bugzilla.redhat.com/show_bug.cgi?id=2447111redhat Patch Available
redhat Patch Available
redhat Patch Available
github Patch Available
Arbitrary file writes from unsanitized user input in cache file name · Advisory · psf/black · GitHub
https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3mgithub_release Patch Available
26.3.1
Patch available: psf/black 26.3.1
https://github.com/psf/black/releases/tag/26.3.1github_pr
Fix some shenanigans with the cache file and IPython
Fix merged in psf/black PR #5038 on 2026-03-12 — awaiting tagged release
https://github.com/psf/black/pull/5038github_commit
commit 4937fe6cf241 (psf/black)
Fix landed in psf/black commit 4937fe6cf241 — awaiting tagged release
https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909dVendor Advisories for CVE-2026-32274(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:13553Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Container Release Update
- RHSA-2026:13545Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
- RHSA-2026:10184Red Hat Product SecurityHigh
Red Hat Security Advisory: RHOAI 2.25.5 - Red Hat OpenShift AI
Patch Availability(3)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | ansible-automation-platform-25/lightspeed-rhel8:1777403872 | 2026-05-04 | redhat |
| redhat | ansible-automation-platform-26/platform-resource-runner-rhel9:1777390333 | 2026-05-04 | redhat |
| redhat | rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9:1776319275 | 2026-04-23 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| black | 18.3a0 ... 26.3.0 (70 versions) | 26.3.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-06 16:27 UTCEPSS rescore
- 2026-07-06 16:27 UTCEPSS rescore
- 2026-07-06 02:23 UTCEPSS rescore
- 2026-07-06 02:23 UTCEPSS rescore
- 2026-07-05 02:30 UTCEPSS rescore
- 2026-07-04 06:31 UTCEPSS rescore
- 2026-07-01 15:06 UTCEPSS rescore
- 2026-06-30 23:22 UTCEPSS rescore
- 2026-06-30 04:34 UTCEG score recompute
- 2026-06-30 04:34 UTCVendor advisory
- 2026-06-30 04:31 UTCNVD updatefirst tracked
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat
Frequently asked(5)
What is CVE-2026-32274?
CVE-2026-32274 is a high vulnerability published on March 12, 2026. Black is the uncompromising Python code formatter. Prior to 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…
When was CVE-2026-32274 disclosed?
CVE-2026-32274 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32274 actively exploited?
CVE-2026-32274 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-32274?
CVE-2026-32274 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-32274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32274, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-32274
Is Your Infrastructure Affected by CVE-2026-32274?
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