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CVE-2026-31900

Black is the uncompromising Python code formatter. 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 con
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d9962ae19b8c4edeed8e0d33b13b03cd1ab1918e05bb9f1a94259b2ce36f7b18
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"black","vendor":"psf","versions":[{"status":"affected","version":"< 26.3.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cc526c4e2d9bc21e7a94954ce6dfbf0d28112aa45ddf88dcb28bffbc4d8099a6 · sha256:53ae27d99381b74c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:cc526c4e2d9bc21e7a94954ce6dfbf0d28112aa45ddf88dcb28bffbc4d8099a6 · sha256:53ae27d99381b74c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cc526c4e2d9bc21e7a94954ce6dfbf0d28112aa45ddf88dcb28bffbc4d8099a6 · sha256:53ae27d99381b74c… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/psf/black/commit/0a2560b981364dde4c8cf8ce9d164c40669a8611","tags":["x_refsource_MISC"],"url":"https://github.com/psf/black/commit/0a2560b981364dde4c8cf8ce9d164c40669a8611"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cc526c4e2d9bc21e7a94954ce6dfbf0d28112aa45ddf88dcb28bffbc4d8099a6 · sha256:53ae27d99381b74c… · /containers/cna/references/1
{"name":"https://github.com/psf/black/security/advisories/GHSA-v53h-f6m7-xcgm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/psf/black/security/advisories/GHSA-v53h-f6m7-xcgm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cc526c4e2d9bc21e7a94954ce6dfbf0d28112aa45ddf88dcb28bffbc4d8099a6 · sha256:53ae27d99381b74c… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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