CVE-2026-54335
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
In Feathersjs version 5.0.44 and earlier, the _.merge function in @feathersjs/commons allows prototype pollution via __proto__, constructor, or prototype keys from JSON.parse.
Risk Assessment
An attacker can inject properties into Object.prototype, potentially leading to remote code execution or other attacks across the Node.js application.
Recommendation
Update @feathersjs/commons to version 5.0.45 or later.
Original NVD description (English source)
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.