CVE-2024-26150: Linuxfoundation Backstage Backend-Common

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

`@backstage/backend-common` is a common functionality library for backends for Backstage, an open platform for building developer portals. In `@backstage/backend-common` prior to versions 0.21.1, 0.20.2, and 0.19.10, paths checks with the `resolveSafeChildPath` utility were not exhaustive enough, leading to risk of path traversal vulnerabilities if symlinks can be injected by attackers. This issue is patched in `@backstage/backend-common` versions 0.21.1, 0.20.2, and 0.19.10.

Affected products

• Linuxfoundation Backstage Backend-Common: before 0.19.10 (fixed in 0.19.10); from 0.20.0, before 0.20.2 (fixed in 0.20.2); version 0.21.0 only

Published 2024-02-23. Last modified 2026-06-17.