@phun-ky/defaults-deep Has a Prototype Pollution issue via Unsafe Recursive Property Merging

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54737
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 18:17:17 UTC
Updated2026-07-31 19:17:10 UTC
Description@phun-ky/defaults-deep is a library like lodash defaultsDeep with array preservation and no lodash dependency. Prior to 2.0.5, defaultsDeep() recursively merges user-supplied objects without filtering proto, constructor, and prototype, allowing properties to be written to Object.prototype. This issue is fixed in version 2.0.5.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Problem Types: CWE-1321 | CWE-1321 CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Phun-ky Defaults-deep affected < 2.0.5 Not specified

References

ReferenceSourceLinkTags
github.com/phun-ky/defaults-deep/security/advisories/GHSA-mj3g-7xcc-x4vh [email protected] github.com
github.com/phun-ky/defaults-deep/pull/49 [email protected] github.com
github.com/phun-ky/defaults-deep/releases/tag/2.0.5 [email protected] github.com
github.com/phun-ky/defaults-deep/commit/807dba930f8718f9126cad59d949b8fd... [email protected] github.com
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