PatchSiren cyber security CVE debrief

CVE-2026-49397 nezhahq CVE debrief

Nezha Monitoring, a self-hostable, lightweight tool for monitoring servers and websites, had a vulnerability from version 2.0.0 to before 2.0.14. The issue allowed for the enumeration of private services (`EnableShowInService: false`) via per-server endpoints, potentially leaking service names and timing data. This vulnerability has been patched in version 2.0.14.

Vendor: nezhahq
Product: nezha
CVSS: MEDIUM 5.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-12
Original CVE updated: 2026-06-12
Advisory published: 2026-06-12
Advisory updated: 2026-06-12

Who should care

Users of Nezha Monitoring, especially those who have private services configured (`EnableShowInService: false`), should be aware of this vulnerability and ensure they are running version 2.0.14 or later to mitigate the risk.

Technical summary

The vulnerability, with a CVSS score of 5.3 (Medium severity), involves CWE-200 (Information Exposure), CWE-285 (Improper Authorization), and CWE-863 (Incorrect Authorization). It allows attackers to enumerate private services, potentially exposing sensitive information about the services' existence and timing.

Defensive priority

Medium

Recommended defensive actions

Update Nezha Monitoring to version 2.0.14 or later to patch the vulnerability.
Review and restrict access to per-server endpoints to prevent unauthorized enumeration of private services.

Evidence notes

The vulnerability was patched in version 2.0.14 of Nezha Monitoring. For more information, refer to [ref-4](https://github.com/nezhahq/nezha/security/advisories/GHSA-vrmh-5mmx-hjwx).

Official resources

CVE-2026-49397 was published on 2026-06-12T22:16:51.813Z and has not been modified since then.