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CVE-2026-54335

LOW
3.7
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-54335
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-12 19:23 UTC
Published
2026-07-17 20:56 UTC
Last updated
2026-07-17 20:56 UTC
Primary CWE
CWE-1321
CWE-1321: Improperly Controlled Modification of Object Proto…
Vendor / Product
feathersjs / feathers
Sources
cve.org  ·  NVD

Severity & Metrics

3.7 LOW CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
feathersjs feathers — < 5.0.45
Weakness (CWE)
CWESourceDescription
CWE-1321 cna CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CVSS scores (1)
ScoreSeverityVersionSourceVector
3.7 LOW 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
References (4)
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