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Medium · 5.3 CVE-2026-125121 EUVD-2026-121399GHSA-r7j4-crjv-h467

compose-lint: Text in a pull request can still issue CI workflow commands through compose-lint 0.31.0's output

Published Nov 10, 2026 · Updated Nov 12, 2026 · Assigned by GitHub_M

Description

compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. In version 0.31.0, compose-lint escapes GitHub Actions workflow-command openers only after ASCII spaces and tabs, while the runner strips all leading Unicode whitespace before interpreting a line. Untrusted Compose values or repository paths beginning with Unicode whitespace followed by :: can therefore reach the text report, fix guidance, the fix dry-run diff, and stderr diagnostics as workflow commands when the package, pre-commit hook, or Docker image runs directly in CI. The GitHub Action is not affected because it disables command processing, and the flaw does not change the lint pass or fail result. This issue is fixed in version 0.32.0.

Affected products

VendorProductAffectedFixed
tmatens compose-lint >= 0.31.0, < 0.32.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI compose-lint >= 0.31.0, < 0.32.0 0.32.0 GHSA-r7j4-crjv-h467

References