Executive Summary

CVE-2025-13465 exposes Lodash 4.0.0‑4.17.22 to prototype pollution via .unset and .omit. Crafted paths can delete methods from global prototypes, weakening security but not overwriting behavior. Patch available in 4.17.23. Not listed in CISA KEV.

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Authoritative CVE Metadata - CVSS Base Score: 5.3 (MEDIUM) - Published: 2026-01-21T20:16:05.250 - Last Modified: 2026-09-09T13:17:21.573

Original Description: Lodash versions 4.0.0 through 4.17.22 are vulnerable to prototype pollution in the .unset and .omit functions. An attacker can pass crafted paths which cause Lodash to delete methods from global prototypes.

The issue permits deletion of properties but does not allow overwriting their original behavior.

This issue is patched on 4.17.23

"We never understand how little we need in this world until we know the loss of it."

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