What’s Vulnerable › Vulnerabilities

CVE-2026-120046: Nezha 2.0.0 before 2.4.0 Startup NULL Pointer Dereference via Orphaned Service History

• 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: 2026-10-30 · updated 2026-10-30
• Weakness: CWE-476

Description

Nezha 2.0.0 before 2.4.0 contains a NULL pointer dereference vulnerability in ServiceSentinel.loadTodayStats that allows authenticated users to crash the dashboard by deleting a service. Attackers can delete their own service via POST /api/v1/batch-delete/service, leaving orphaned service_histories rows that crash the non-TSDB dashboard on its next startup until removed manually.

Affected products

• nezhahq nezha: from 2.0.0 before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: nezhahq nezha 2.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/nezhahq/nezha
• https://github.com/nezhahq/nezha/blob/9881c47f0cc92256ba203919da5a25fab79a6bad/cmd/dashboard/controller/service.go#L639
• https://github.com/nezhahq/nezha/blob/9881c47f0cc92256ba203919da5a25fab79a6bad/service/singleton/servicesentinel.go#L434
• https://github.com/nezhahq/nezha/commit/efd3e07b901d6acf7ef2ab3b26458cc07e7605dc
• https://github.com/nezhahq/nezha/releases/tag/v2.4.0
• https://www.vulncheck.com/advisories/nezha-2.0.0-before-2.4.0-startup-null-pointer-dereference-via-orphaned-service-history

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