PatchSiren

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
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

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).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49397 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49397

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49397 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49397

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.