High severity7.7NVD Advisory· Published Mar 7, 2026· Updated Jul 15, 2026
CVE-2026-29186
CVE-2026-29186
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@backstage/plugin-techdocs-nodenpm | < 1.14.3 | 1.14.3 |
Affected products
3- cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*Range: <1.14.3
Patches
Vulnerability mechanics
References
11- github.com/advisories/GHSA-928r-fm4v-mvrwghsaADVISORY
- github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrwnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-29186ghsaADVISORY
- backstage.io/docs/features/techdocs/architectureghsaWEB
- www.mkdocs.org/about/release-notes/ghsaWEB
- www.mkdocs.org/user-guide/configuration/ghsaWEB
- access.redhat.com/errata/RHSA-2026:13826nvd
- access.redhat.com/errata/RHSA-2026:9742nvd
- access.redhat.com/security/cve/CVE-2026-29186nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.jsonnvd
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