CVE-2026-49397 nezhahq CVE debrief

Who should care

Defenders responsible for Nezha Monitoring instances, especially those with private services, should assess exposure and apply patches or mitigations to prevent service enumeration and information disclosure. Security teams and vulnerability management teams should review the vulnerability and verify exposure of affected deployments. Operators and administrators of Nezha Monitoring instances should also be aware of the vulnerability and take necessary rem…

Why it matters

CVE-2026-49397 is a medium-severity vulnerability in Nezha Monitoring that allows private service enumeration, potentially leading to information disclosure. Defenders responsible for Nezha Monitoring instances should assess exposure and apply patches or mitigations.

• Service enumeration can lead to information disclosure.
• Private service names and timing data may be leaked.
• Defenders should verify exposure and apply patches or mitigations.

Technical summary

Nezha Monitoring instances with private services (EnableShowInService: false) are vulnerable to service enumeration via per-server endpoints, leaking name and timing data. This issue was patched in version 2.0.14. Defenders should prioritize verifying exposure of Nezha Monitoring instances, especially those with private services, and apply patches or mitigations to prevent service enumeration and potential information disclosure. Affected deployments should be reviewed for exposure, and compensating controls should be considered while remediation is scheduled.

Defensive priority

Defenders should prioritize verifying exposure of Nezha Monitoring instances, especially those with private services, and apply patches or mitigations.

Recommended defensive actions

• Verify exposure of Nezha Monitoring instances, especially those with private services.
• Apply patches or mitigations to prevent service enumeration.
• Monitor for potential exploitation attempts.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation steps is limited. Defenders should verify exposure of Nezha Monitoring instances, especially those with private services, and apply patches or mitigations. The CVE record was published on 2026-06-12T22:16:51.813Z and has not been modified since then. No additional information is available on exploit attempts or affected deployments.

Sources and 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.