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CVE-2026-54335— Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__

Quick assessment

Affected
feathersjs feathers
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.

feathersjs feathers是feathersjs社区开源的一个实时应用框架。 Feathers 5.0.45之前版本存在输入验证错误漏洞，该漏洞源于_.merge工具函数在递归合并JSON.parse产生的对象时，会将其中的__proto__、constructor和prototype键视为自有可枚举属性，从而导致原型污染。

CVSS 3.7 · Low EPSS 0.39% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
feathersjs feathers < 5.0.45 affected
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I. Basic Information for CVE-2026-54335

Vulnerability Information
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Vulnerability Title
Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__
Source: CVE Program / CVE List V5
Vulnerability Description
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target['__proto__'] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Feathers 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
feathersjs feathers是feathersjs社区开源的一个实时应用框架。 Feathers 5.0.45之前版本存在输入验证错误漏洞，该漏洞源于_.merge工具函数在递归合并JSON.parse产生的对象时，会将其中的__proto__、constructor和prototype键视为自有可枚举属性，从而导致原型污染。
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 feathers < 5.0.45 -

II. Public POCs for CVE-2026-54335

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III. Intelligence Information for CVE-2026-54335

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Patches & Fixes for CVE-2026-54335 (2)

Vendor Advisories for CVE-2026-54335 (1)

Vendor Pages for CVE-2026-54335 (1)

IV. Related Vulnerabilities

Same product: feathers
Same vendor: feathersjs
Same weakness: CWE-1321