Path Traversal in Nezhahq Nezha
CVE-2026-53519
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.019 (78.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Nezhahq Nezha — versions < 2.0.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-53519?
- CVE-2026-53519 is a critical-severity vulnerability in Nezhahq Nezha, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-06-12.
- How severe is CVE-2026-53519?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-53519 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.