CVE-2026-29186
CVE-2026-29186 · @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.7 · High · EPSS 0.8% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
backstage
- Versions
- < 1.14.3: Affected
No fix published
@backstage/plugin-techdocs-node npm
- Affected ranges
- SEMVER: < 1.14.3
Update to 1.14.3
Original sources
- https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw
- https://access.redhat.com/security/cve/CVE-2026-29186
- https://bugzilla.redhat.com/show_bug.cgi?id=2445480
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.json
- https://access.redhat.com/errata/RHSA-2026:9742
- https://access.redhat.com/errata/RHSA-2026:13826
- https://nvd.nist.gov/vuln/detail/CVE-2026-29186