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CVE

CVE-2026-32274

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

CVE-2026-32274

Black: Arbitrary file writes from unsanitized user input in cache file name

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.7
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/psf/black/releases/tag/26.3.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32274.json, https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m, https://nvd.nist.gov/vuln/detail/CVE-2026-32274, https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d, https://github.com/psf/black/pull/5038

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00021%
EPSS Percentile
0.06013%
Introduced Version
0
Fix Available
c6755bb741b6481d6b3d3bb563c83fa060db96c9,0.16.0-r22,1.23.0-r0,2.7.0-r2,0.8.10-r1

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