CVE-2026-125121

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.

• CWE-117
• CWE-150

• https://github.com/advisories/GHSA-6f4g-xm8v-pgv6
• https://github.com/tmatens/compose-lint/commit/542e63126f795564a65c63887ea0dc558a500688
• https://github.com/tmatens/compose-lint/pull/945
• https://github.com/tmatens/compose-lint/releases/tag/v0.32.0
• https://github.com/tmatens/compose-lint/security/advisories/GHSA-r7j4-crjv-h467

Published

Nov 10, 2026

Last Modified

Nov 10, 2026

Status

Received

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