CVE-2026-53519: Nezhahq Nezha

Critical severity, CVSS 9.1. EPSS: 2.3% chance of exploitation in the next 30 days.

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. Prior to version 2.0.13, fallbackToFrontend in the dashboard's NoRoute handler treats any URL whose raw string starts with /dashboard as an admin-frontend asset request. The check uses strings.HasPrefix, not a path-segment match, so the input /dashboard../data/config.yaml is accepted; strings.TrimPrefix leaves ../data/config.yaml; and path.Join("admin-dist", "../data/config.yaml") normalizes to data/config.yaml — which os.Stat finds and http.ServeFile returns. No authentication required. This issue has been patched in version 2.0.13.

Affected products

• Nezhahq Nezha: before 2.0.13 (fixed in 2.0.13)

Published 2026-06-12. Last modified 2026-06-17.