GHSA-2p49-45hj-7mc9

Source

https://github.com/advisories/GHSA-2p49-45hj-7mc9

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-2p49-45hj-7mc9/GHSA-2p49-45hj-7mc9.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-2p49-45hj-7mc9

Aliases

CVE-2026-24047

Published

2026-01-21T22:40:51Z

Modified

2026-02-03T03:10:16.981108Z

Severity

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

Summary

@backstage/cli-common has a possible `resolveSafeChildPath` Symlink Chain Bypass

Details

Impact

The resolveSafeChildPath utility function in @backstage/backend-plugin-api, which is used to prevent path traversal attacks, failed to properly validate symlink chains and dangling symlinks. An attacker could bypass the path validation by:

Symlink chains: Creating link1 → link2 → /outside where intermediate symlinks eventually resolve outside the allowed directory
Dangling symlinks: Creating symlinks pointing to non-existent paths outside the base directory, which would later be created during file operations

This function is used by Scaffolder actions and other backend components to ensure file operations stay within designated directories.

Patches

This vulnerability is fixed in @backstage/backend-plugin-api version 0.1.17. Users should upgrade to this version or later.

Workarounds

Run Backstage in a containerised environment with limited filesystem access
Restrict template creation to trusted users

Database specific

{
    "severity": "MODERATE",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-59",
        "CWE-61"
    ],
    "github_reviewed_at": "2026-01-21T22:40:51Z",
    "nvd_published_at": "2026-01-21T23:15:53Z"
}

References

Affected packages

npm / @backstage/cli-common

Package

Name: @backstage/cli-common; View open source insights on deps.dev
Purl: pkg:npm/%40backstage/cli-common

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.1.17

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-2p49-45hj-7mc9/GHSA-2p49-45hj-7mc9.json"

last_known_affected_version_range

"<= 0.1.16"