by Kastro CVE-2026-29186
backstage backstage — @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
backstage< 1.14.3–CNA
Red Hat Developer Hub 1.8see advisory1776784286redhat-SADP
Red Hat Developer Hub 1.9see advisory1777903262redhat-SADP
Self-service automation portal 2see advisory–redhat-SADP
Scores by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADP (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
GitHub_M (CNA)7.7CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total