High 7.7Published Mar 7, 2026

CVE-2026-29186@backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Updated under an hour ago (Oct 27, 2026, 7:10 AM ET)

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It affects backstage and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
Weakness (CWE): CWE-434, CWE-74, CWE-791
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

backstage backstage backstage:backstage (from the name)	before 1.14.3	CNA record
Red Hat Red Hat Developer Hub 1.8 redhat:rhdh	from 1776784286 not affected	CISA ADP
Red Hat Self-service automation portal 2 redhat:ansible_portal	2	CISA ADP
linuxfoundation backstage_plugin-techdocs-node linuxfoundation:backstage_plugin-techdocs-node	before 1.14.3	NVD

References

References

https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw	x-refsource-confirm, 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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.