GHSA-4488-j8vj-vqqv

Suggest an improvement
Source
https://github.com/advisories/GHSA-4488-j8vj-vqqv
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4488-j8vj-vqqv/GHSA-4488-j8vj-vqqv.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4488-j8vj-vqqv
Aliases
Published
2026-10-07T18:03:22Z
Modified
2026-10-07T18:15:10Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L CVSS Calculator
Summary
Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
Details

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.
Database specific 
{
    "cwe_ids": [
        "CWE-183",
        "CWE-470"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T18:03:22Z",
    "nvd_published_at": "2026-10-07T15:17:12Z",
    "severity": "HIGH"
}
References

Affected packages

npm / @backstage/plugin-techdocs-node

Package

Name
@backstage/plugin-techdocs-node
View open source insights on deps.dev
Purl
pkg:npm/%40backstage/plugin-techdocs-node

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.15.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4488-j8vj-vqqv/GHSA-4488-j8vj-vqqv.json"