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EUVD-2026-337457

fkie_cve-2026-25153

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, when TechDocs is configured with `runIn: local`, a malicious actor who can submit or modify a repository's `mkdocs.yml` file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. @backstage/plugin-techdocs-node versions 1.13.11 and 1.14.1 contain a fix. The fix introduces an allowlist of supported MkDocs configuration keys. Unsupported configuration keys (including `hooks`) are now removed from `mkdocs.yml` before running the generator, with a warning logged to indicate which keys were removed. Users of `@techdocs/cli` should also upgrade to the latest version, which includes the fixed `@backstage/plugin-techdocs-node` dependency. Some workarounds are available. Configure TechDocs with `runIn: docker` instead of `runIn: local` to provide container isolation, though it does not fully mitigate the risk. Limit who can modify `mkdocs.yml` files in repositories that TechDocs processes; only allow trusted contributors. Implement PR review requirements for changes to `mkdocs.yml` files to detect malicious `hooks` configurations before they are merged. Use MkDocs < 1.4.0 (e.g., 1.3.1) which does not support hooks. Note: This may limit access to newer MkDocs features. Building documentation in CI/CD pipelines using `@t…

GHSA-6jr7-99pf-8vgf — @backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

Affected: npm: @backstage/plugin-techdocs-node

### Impact

When TechDocs is configured with `runIn: local`, a malicious actor who can submit or modify a repository's `mkdocs.yml` file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration.

### Patches

Upgrade to `@backstage/plugin-techdocs-node` version 1.13.11, 1.14.1 or later. The fix introduces an allowlist of supported MkDocs configuration keys. Unsupported configuration keys (including `hooks`) are now removed from `mkdocs.yml` before running the generator, with a warning logged to indicate which keys were removed.

**Note**: Users of `@techdocs/cli` should also upgrade to the latest version, which includes the fixed `@backstage/plugin-techdocs-node` dependency.

### Workarounds

If you cannot upgrade immediately:

1. Use Docker mode with restricted access: Configure TechDocs with `runIn: docker` instead of `runIn: local`. This provides container isolation, though it does not fully mitigate the risk. 2. Restrict repository access: Limit who can modify `mkdocs.yml` files in repositories that TechDocs processes. Only allow trusted contributors. 3. Manual review: Implement PR review requirements for changes to `mkdocs.yml` files to detect malicious `hooks` configurations before they are merged. 4. Downgrade MkDocs: Use MkDocs < 1.4.0 (e.g., 1.3.1) which does not support hooks. Note: This may limit access to newer MkDocs features.

**Note**: Building documentation in CI/CD pipelines using `@techdocs/cli` does not mitigate this vu…

RHSA-2026:6174 — Red Hat Security Advisory: Red Hat Developer Hub 1.8.5 release.

jsonpath: jsonpath: Prototype Pollution vulnerability in the value function multer: Multer: Denial of Service via dropped file upload connections multer: Multer: Denial of Service via malformed requests multer: Multer: Denial of Service via malformed requests backstage/backend-defaults: backstage/plugin-scaffolder-backend: backstage/plugin-scaffolder-node: possible symlink path traversal in scaffolder actions @backstage/plugin-techdocs-node: @backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks axios: Axios affected by Denial of Service via __proto__ Key in mergeConfig fast-xml-parser: fast-xml-parser: Cross-Site Scripting (XSS) due to improper DOCTYPE entity handling fast-xml-parser: fast-xml-parser: Denial of Service via unlimited XML entity expansion rollup: Rollup: Remote Code Execution via Path Traversal Vulnerability fast-xml-parser: fast-xml-parser: Stack overflow leads to Denial of Service google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation