CVE-2026-29186
High
Description
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.
SeverityHigh
CVSS7.7
Exploit probability—
ProductLinuxfoundation Backstage Plugin-techdocs-node
PublishedMar 7, 2026
First seenMar 7, 2026
How to fix
Update
- linuxfoundation backstage_plugin-techdocs-node1.14.3 or later
- @backstage/plugin-techdocs-node1.14.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage_plugin-techdocs-node | v < 1.14.3 | 1.14.3 |
| @backstage/plugin-techdocs-nodenpm | v < 1.14.3 | 1.14.3 |
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