GHSA-f7v3-xhm6-w245

Source

https://github.com/advisories/GHSA-f7v3-xhm6-w245

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-f7v3-xhm6-w245/GHSA-f7v3-xhm6-w245.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-f7v3-xhm6-w245

Aliases

CVE-2026-106557

Published

2026-10-07T16:22:58Z

Modified

2026-10-07T16:30:06Z

Severity

7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator

Summary

Backstage has improper input validation in TechDocs Markdown extension configuration

Details

Impact

An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary. Depending on deployment configuration, this may expose sensitive backend-host data or internal network resources.

Patches

Patched in @backstage/plugin-techdocs-node version 1.15.4.

Adopters must also use pymdown-extensions version 10.21.3 or newer, normally through mkdocs-techdocs-core version 1.7.0 or newer. @backstage/plugin-techdocs-node does not control the Python dependencies used by the generator; with an older PyMdown release, snippets may remain vulnerable to file inclusion even after their configuration is sanitized.

Workarounds

Generate TechDocs only from trusted repositories with reviewed MkDocs configuration.
Use isolated build environments with restricted filesystem access and network egress.
Prefer externally generated TechDocs with appropriately sandboxed CI.

Database specific

{
    "cwe_ids": [
        "CWE-22",
        "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T16:22:58Z",
    "nvd_published_at": null,
    "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-f7v3-xhm6-w245/GHSA-f7v3-xhm6-w245.json"