Prototype Pollution in Phun-ky Defaults-deep

CVE-2026-54737

@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, all…

Vulnerability class: Prototype Pollution

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54737?
CVE-2026-54737 is a high-severity vulnerability in Phun-ky Defaults-deep, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.3/10. Published 2026-07-31.
How severe is CVE-2026-54737?
High severity. CVSS v3 base score is 7.3 out of 10.