CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2026-29186
Critical (9.8) in linuxfoundation backstage plugin-techdocs-node. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in @backstage/plugin-techdocs-node 1.14.3.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-74, CWE-434, CWE-791
- Published
- Modified
- Record from
- the NVD, synced
Affected
- linuxfoundation:backstage_plugin-techdocs-node
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-928r-fm4v-mvrw | npm | @backstage/plugin-techdocs-node | <1.14.3 | 1.14.3 |