CVE-2026-125121

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.

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Weakness Type (CWE)

CWE-117 CWE-117

CWE-150 CWE-150

References

Other References

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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-125121? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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