CVE-2026-123368

compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.22.0 until 0.31.0, compose-lint follows a sibling .env symbolic link outside the project without applying its normal containment check. From 0.28.0, the same gap also affects an include project_directory link outside the project. A pull request can reference a variable from the linked file, causing substitution to place runner file or process-environment data into finding messages written to logs, JSON, SARIF artifacts, and Code Scanning alerts. Reading /proc/self/environ can expose the remainder of the linter process environment because NUL-separated entries are treated as one value, although disclosure requires a workflow that processes untrusted changes with useful environment data and GitHub normally withholds secrets from fork pull requests. The pass or fail result is not changed. This issue is fixed in version 0.31.0.

• CWE-22
• CWE-59

• https://github.com/tmatens/compose-lint/commit/c43204ad4dab11d54e20574a52bc4e5835246ca5
• https://github.com/tmatens/compose-lint/pull/917
• https://github.com/tmatens/compose-lint/releases/tag/v0.31.0
• https://github.com/tmatens/compose-lint/security/advisories/GHSA-6wcv-rj3c-mhv3

Published

Nov 9, 2026

Last Modified

Nov 13, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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