Is CVE-2026-32274 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-32274 being exploited in the wild.

How severe is CVE-2026-32274?

High severity, with a CVSS score of 7.5, published 12 March 2026.

Which products and versions are affected?

black (PyPI) ECOSYSTEM:introduced=0,fixed=26.3.1, ECOSYSTEM:introduced=24.3.0,fixed=26.3.1.

Is there a fix for CVE-2026-32274?

Yes. black (PyPI): upgrade to 26.3.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-32274 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-32274?

Check whether you run black (PyPI), Python Black or Red Hat OpenShift Lightspeed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-32274: psf Black arbitrary file write via unsanitized cache filename

CVE-2026-32274 · Severity: high · CVSS 7.5 · Published 2026-03-12

Black, a popular Python code formatter, contains a vulnerability that allows an attacker to write files to unauthorized locations on a computer's file system. By providing a specially crafted input to a specific configuration option, an attacker could potentially overwrite critical system or application files. This could lead to system instability or be used as a stepping stone for further attacks.

Technologies: black (PyPI), Red Hat OpenShift Lightspeed. Vendors: PyPI, Python, Red Hat.

Quick answers

Is CVE-2026-32274 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-32274 being exploited in the wild.
How severe is CVE-2026-32274?: High severity, with a CVSS score of 7.5, published 12 March 2026.
Which products and versions are affected?: black (PyPI) ECOSYSTEM:introduced=0,fixed=26.3.1, ECOSYSTEM:introduced=24.3.0,fixed=26.3.1.
Is there a fix for CVE-2026-32274?: Yes. black (PyPI): upgrade to 26.3.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-32274 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-32274?: Check whether you run black (PyPI), Python Black or Red Hat OpenShift Lightspeed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

black (PyPI): upgrade to 26.3.1 or later
```
pip install "black>=26.3.1"
```

Technical details

A path traversal vulnerability exists in Black's caching mechanism. The application constructs cache filenames using various formatting options, including the value provided to the `--python-cell-magics` command-line argument. Because this value is not sanitized before being incorporated into the file path, an attacker who can control this argument can perform a path traversal attack to write cache files to arbitrary locations on the filesystem. This is tracked as CWE-22. The issue is fixed in version 26.3.1 by implementing proper sanitization of the affected option.

Affected products

psf black >= 24.3.0, < 26.3.1

Identifiers

CVE-2026-32274
GHSA-3936-cmfr-pm3m
PYSEC-2026-2121

Timeline

2026-03-12: disclosed
2026-03-12: advisory
2026-03-12: patched

References

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