CVE-2026-123370

compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.9.0 until 0.18.0, compose-lint's YAML parser recognizes lone carriage returns and Unicode line separators U+0085, U+2028, and U+2029 as line breaks while fix position conversion counts only newline characters. A pull request can place one of these separators in a quoted value so fix --apply shifts each later edit and deletes the line after the selected target, including an unselected network or other security setting. The resulting Compose file can remain valid, post-edit checks can pass, and the command can report a successful fix even though the dry-run diff was the only place showing the extra deletion. This issue is fixed in version 0.18.0.

• CWE-193

• https://github.com/tmatens/compose-lint/commit/c9d453a6a69c076788fe1db05cb54684a616d1de
• https://github.com/tmatens/compose-lint/commit/cbbf886d91347dea9c51b584eb50088e70007d0d
• https://github.com/tmatens/compose-lint/pull/547
• https://github.com/tmatens/compose-lint/pull/549
• https://github.com/tmatens/compose-lint/releases/tag/v0.18.0
• https://github.com/tmatens/compose-lint/security/advisories/GHSA-65v8-q222-64xx
• https://github.com/tmatens/compose-lint/security/advisories/GHSA-65v8-q222-64xx

Published

Nov 9, 2026

Last Modified

Nov 14, 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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