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.
// patches
This issue is patched on 4.17.23.
// cvss v3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Checked 2026-09-26 at 01:03 UTC. The most recent advisory here was published 2026-01-21. Updated continuously from NVD, GHSA, OSV and CNA feeds.