CVE-2026-49397

Deferred Deferred - Pending Action

Nezha Monitoring Private Service Enumeration Vulnerability

Publication date: 2026-06-12

Last updated on: 2026-06-15

Assigner: GitHub, Inc.

Description

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 2.0.0 to before version 2.0.14, private services (`EnableShowInService: false`) are enumerable via per-server endpoints, leaking name and timing data. This issue has been patched in version 2.0.14.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-12

Last Modified

2026-06-15

Generated

2026-07-03

AI Q&A

2026-06-13

EPSS Evaluated

2026-07-02

NVD

CVE-2026-49397

Affected Vendors & Products

Vendor	Product	Version / Range
nezha_monitoring	nezha_monitoring	From 2.0.0 (inc) to 2.0.14 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-285	The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Compliance Impact

This vulnerability allows enumeration of private services, leaking their names and timing data via per-server endpoints. Such leakage of potentially sensitive information could impact compliance with data protection regulations like GDPR or HIPAA, which require safeguarding of personal and sensitive data. However, the CVE description does not explicitly mention any direct compliance impact or regulatory considerations.

Executive Summary

This vulnerability affects Nezha Monitoring versions from 2.0.0 up to but not including 2.0.14. It allows private services, which are supposed to be hidden (with the setting EnableShowInService set to false), to be enumerated through per-server endpoints. This means that information such as the names and timing data of these private services can be accessed or leaked unintentionally.

Impact Analysis

The impact of this vulnerability is that sensitive information about private services, including their names and timing data, can be exposed to unauthorized parties. This could potentially allow attackers to gain insights into the monitored infrastructure, which might be used for further attacks or reconnaissance. The CVSS score of 5.3 indicates a medium severity with network attack vector and no privileges or user interaction required.

Mitigation Strategies

To mitigate this vulnerability, upgrade Nezha Monitoring to version 2.0.14 or later, where the issue has been patched.

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