---
id: CVE-2026-111383
title: Nezha 2.0.13 before 2.3.15 Denial of Service via /api/v1/ws/transfer WebSocket
summary: >-
  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
  subscrip…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-770
vendor: nezhahq
product: nezha
affected:
  - nezha >= 2.0.13 < 2.3.15
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T01:17:52.239Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111383'
references:
  - url: 'https://github.com/nezhahq/nezha/security/advisories/GHSA-ch6h-w872-77mx'
    label: GitHub Security Advisory (GHSA-ch6h-w872-77mx)
  - url: >-
      https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f
    label: Patch Commit
  - url: >-
      https://www.vulncheck.com/advisories/nezha-2.0.13-before-2.3.15-denial-of-service-via-api-v1-ws-transfer-websocket
    label: >-
      VulnCheck Advisory: Nezha 2.0.13 before 2.3.15 Denial of Service via
      /api/v1/ws/transfer WebSocket
tags:
  - cve.org
ingestedAt: '2026-10-16T01:55:57.991Z'
---

## Overview

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

- `nezha >= 2.0.13 < 2.3.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.