{"id":"CVE-2026-106510","aliases":["GHSA-4488-j8vj-vqqv"],"url":"https://o3.security/vulnerability/CVE-2026-106510","summary":"Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml","details":"### Impact\n\nAn 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.\n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node`, version `1.15.4`.\n\n### Workarounds\n\nIf you cannot upgrade immediately:\n\n- Switch to `techdocs.builder: external` to isolate TechDocs builds in a container.\n- Restrict who can register catalog entities with TechDocs annotations.\n- Audit existing catalog entities for suspicious `markdown_extensions` values in their `mkdocs.yml` files.","published":"2026-10-07T14:36:53.929Z","modified":"2026-10-21T02:54:35.537274560Z","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node","fixedVersion":"1.15.4"}],"fix":{"url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","label":"backstage/backstage@02cd7cd"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106510.json"},{"type":"ADVISORY","url":"https://github.com/backstage/backstage/security/advisories/GHSA-4488-j8vj-vqqv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106510"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:54:35.537274560Z"}}