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CVE-2026-29793— NoSQL Injection via WebSocket id Parameter in MongoDB Adapter

Quick assessment

Affected
@feathersjs mongodb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Feathers是Feathers开源的一个轻量级的 Web 框架。用于使用 TypeScript 或 JavaScript 创建 API 和实时应用程序。 Feathers 5.0.0版本至5.0.42之前版本存在安全漏洞，该漏洞源于传输层未对Socket.IO客户端发送的id参数进行类型检查，当使用MongoDB适配器时可能导致查询操作符注入。

AI Predicted 9.8 Difficulty: Easy EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-29793

Vulnerability Information
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Vulnerability Title
NoSQL Injection via WebSocket id Parameter in MongoDB Adapter
Source: CVE Program / CVE List V5
Vulnerability Description
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, Socket.IO clients can send arbitrary JavaScript objects as the id argument to any service method (get, patch, update, remove). The transport layer performs no type checking on this argument. When the service uses the MongoDB adapter, these objects pass through getObjectId() and land directly in the MongoDB query as operators. Sending {$ne: null} as the id matches every document in the collection. This vulnerability is fixed in 5.0.42.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
Feathers 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Feathers是Feathers开源的一个轻量级的 Web 框架。用于使用 TypeScript 或 JavaScript 创建 API 和实时应用程序。 Feathers 5.0.0版本至5.0.42之前版本存在安全漏洞，该漏洞源于传输层未对Socket.IO客户端发送的id参数进行类型检查，当使用MongoDB适配器时可能导致查询操作符注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
@feathersjs mongodb >= 5.0.0, < 5.0.42 -

II. Public POCs for CVE-2026-29793

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III. Intelligence Information for CVE-2026-29793

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Vendor Advisories for CVE-2026-29793 (1)

IV. Related Vulnerabilities

Same product: mongodb
Same weakness: CWE-943

V. Comments for CVE-2026-29793

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