CVE-2026-53519

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductGithub.com/nezhahq/nezha

PublishedJun 12, 2026

First seenJun 12, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

github.com/nezhahq/nezha2.0.13 or later

Affected products

Product	Affected versions	Fixed in
github.com/nezhahq/nezhaGo	v < 2.0.13, No range specified	2.0.13

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