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CVE

CVE-2026-31900

Black's vulnerable version parsing leads to RCE in GitHub Action
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CVE

CVE-2026-31900

Black's vulnerable version parsing leads to RCE in GitHub Action

Impact

Black provides a GitHub action for formatting code. This action supports an option, use_pyproject: true, for reading the version of Black to use from the repository pyproject.toml. A malicious pull request could edit pyproject.toml to use a direct URL reference to a malicious repository. This could lead to arbitrary code execution in the context of the GitHub Action. Attackers could then gain access to secrets or permissions available in the context of the action.

Patches

Version 26.3.0 fixes this vulnerability by tightening the validation of the version field. Users who use the GitHub Action as psf/black@stable will automatically pick up this update.

Workarounds

Do not use the use_pyproject: true option in the psf/black GitHub Action.

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:L/UI:N/VC:H/VI:H/VA:H/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/security/advisories/GHSA-v53h-f6m7-xcgm, https://nvd.nist.gov/vuln/detail/CVE-2026-31900, https://github.com/psf/black/commit/0a2560b981364dde4c8cf8ce9d164c40669a8611, https://github.com/psf/black

Severity

9.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.8
EPSS Probability
0.00116%
EPSS Percentile
0.30129%
Introduced Version
0
Fix Available
26.3.0

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