🛡️ CVE-2026-29186
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-434 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
CWE CWE-434
Public Exploit ✅ No
Source NVD
Published 2026-03-05
Updated 2026-06-02
Modified 2026-03-09
Fix URL N/A

Affected Packages

Software From version Fixed in
@backstage/plugin-techdocs-node
backstage-plugin-techdocs-node 1.14.3

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