Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
### Impact An authenticated user who can register catalog entities can provide a crafted `mkdocs.yml` causing arbitrary OS command execution on the TechDocs build host when the docs are built. ### Patches Patched in `@backstage/plugin-techdocs-node`, version `1.15.4`. ### Workarounds If you cannot upgrade immediately: - Switch to `techdocs.builder: external` to isolate TechDocs builds in a container. - Restrict who can register catalog entities with TechDocs annotations. - Audit existing catalog entities for suspicious `markdown_extensions` values in their `mkdocs.yml` files.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-106510US | — | — | ||
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by remote code execution via crafted markdow… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/backstage/backstagePACKAGE
- https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbbWEB
- https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9dWEB
- https://github.com/backstage/backstage/releases/tag/v1.50.5WEB
- https://github.com/backstage/backstage/releases/tag/v1.54.6WEB
- https://github.com/backstage/backstage/security/advisories/GHSA-4488-j8vj-vqqvWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-106510ADVISORY
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