CVE-2026-49397: Nezha Monitoring: Private services (`EnableShowInService: false`) are enumerable via per-server endpoints, leaking name and timing data

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-10-25
Weakness: CWE-200

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.

Affected products

nezhahq nezha: from 2.0.0, < 2.0.14

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-vrmh-5mmx-hjwx
https://github.com/nezhahq/nezha/security/advisories/GHSA-vrmh-5mmx-hjwx

Get alerted when CVE-2026-49397 or the next vulnerability affects your stack