Is CVE-2026-54737 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-54737?

CVE-2026-54737 has a CVSS v3 severity of HIGH (7.3).

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CVE-2026-54737

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.