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Vulnerability record · CVE-2026-29186 · published 7 March 2026

CVE-2026-29186: Linuxfoundation backstage plugin-techdocs-node injection vulnerability

Linuxfoundation · Backstage Plugin Techdocs Node

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.

9.8 CVSS 3.1 Critical EPSS 0.91% · top 41.6% CWE-74 · InjectionCWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score
0.91%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:13826
https://access.redhat.com/errata/RHSA-2026:9742
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

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Source: NIST National Vulnerability Database (record CVE-2026-29186), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.