CVE-2026-32274

CVE-2026-32274 is a high-severity vulnerability in Python Black with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

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.

Frequently asked questions

What is CVE-2026-32274?
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.
How severe is CVE-2026-32274?
CVE-2026-32274 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-32274 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32274?
CVE-2026-32274 affects Python Black. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32274?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-32274 have an EU (EUVD) identifier?
Yes. CVE-2026-32274 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11698.
When was CVE-2026-32274 published?
CVE-2026-32274 was published on 2026-03-12 and last updated on 2026-08-03.

References

Affected products (1)

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