CVE-2026-25153: @backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

February 2, 2026

When TechDocs is configured with runIn: local, a malicious actor who can submit or modify a repository’s mkdocs.yml file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration.

References

github.com/advisories/GHSA-6jr7-99pf-8vgf
github.com/backstage/backstage
github.com/backstage/backstage/security/advisories/GHSA-6jr7-99pf-8vgf
nvd.nist.gov/vuln/detail/CVE-2026-25153

Code Behaviors & Features

Detect and mitigate CVE-2026-25153 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →