CVE-2026-123371 compose-lint: A `.compose-lint.yml` symlinked outside the project is read, and a parse error quotes part of the target
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123371?
CVE-2026-123371 is a low-severity vulnerability in tmatens compose-lint, published on 9 Nov 2026.
Official description
compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.2.0 until 0.32.0, compose-lint automatically follows a .compose-lint.yml policy-file symbolic link outside the project and includes part of the target line when that external file fails YAML parsing. A pull request can point the policy file at a runner credential file, causing about 30 characters around an attacker-uncontrolled parse position to appear in standard error, JSON errors, and SARIF tool execution notifications uploaded by the GitHub Action. The run exits with an error and the attacker cannot select the exact disclosed line, but public logs or Code Scanning output can reveal part of the target. This issue is fixed in version 0.32.0.
Which versions are affected by CVE-2026-123371?
2 open source packages ship an affected version, including tmatens/compose-lint and compose-lint.
| Package | Affected | Fixed in |
|---|---|---|
tmatens/compose-lint GitHub Actions | From 0.2.0 | 0.32.0 |
compose-lint PyPI | From 0.2.0 | 0.32.0 |
How do I fix CVE-2026-123371?
Upgrade tmatens/compose-lint to 0.32.0 or later.
Is CVE-2026-123371 being exploited?
There is no known exploitation of CVE-2026-123371 in the wild and no public exploit code.
Sources
Also known as GHSA-88f4-frh5-gmcr.