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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
feathersjs feathers affected
Version Status Constraints
< 5.0.45 affected —

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No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-28xv-ph75-77wh Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc cve-icon
https://github.com/feathersjs/feathers/pull/3690 cve-icon
https://github.com/feathersjs/feathers/releases/tag/v5.0.45 cve-icon
https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh cve-icon
History

Fri, 17 Jul 2026 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Feathersjs
Feathersjs feathers
Vendors & Products Feathersjs
Feathersjs feathers

Fri, 17 Jul 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-17T20:56:51.857Z

Reserved: 2026-06-12T19:23:22.316Z

Link: CVE-2026-54335

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-17T22:30:04Z

Weaknesses