What’s Vulnerable › Vulnerabilities

CVE-2026-111383: Nezha 2.0.13 before 2.3.15 Denial of Service via /api/v1/ws/transfer WebSocket

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-16
• Weakness: CWE-770

Description

Nezha from 2.0.13 before 2.3.15 contains a resource exhaustion vulnerability that allows authenticated users to open unbounded concurrent connections to the /api/v1/ws/transfer WebSocket endpoint. Attackers can hold thousands of subscriptions created by ServerTransferClass.Subscribe without limits, exhausting file descriptors, memory, and goroutines and blocking agent gRPC reconnections.

Affected products

• nezhahq nezha: from 2.0.13 before 2.3.15 — fixed in 2.3.15

How to fix

Upgrade to a fixed version: nezhahq nezha 2.3.15. Check the vendor advisory for mitigations.

References

• https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f
• https://github.com/nezhahq/nezha/security/advisories/GHSA-ch6h-w872-77mx
• https://www.vulncheck.com/advisories/nezha-2.0.13-before-2.3.15-denial-of-service-via-api-v1-ws-transfer-websocket
• https://github.com/nezhahq/nezha/security/advisories/GHSA-ch6h-w872-77mx

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