CVE-2026-29186
HighCVSS 7.7Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
A vulnerability in @backstage/plugin-techdocs-node allows bypassing the allowlist of MkDocs configuration keys, leading to arbitrary Python code execution during documentation builds. The issue is fixed in version 1.14.3.
Risk Assessment
An attacker can inject a malicious mkdocs.yml configuration, resulting in arbitrary code execution on the server, potentially leading to full system compromise and data exfiltration.
Recommendation
Immediately update @backstage/plugin-techdocs-node to version 1.14.3 or later. Review existing mkdocs.yml files for suspicious entries.
Other vulnerabilities in @backstage/plugin-techdocs-node
Original NVD description (English source)
Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.