GHSA-f23m-r3pf-42rh — lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`

2026-10-01T21:26:55.945660+00:00

Affected: npm: lodash, npm: lodash-es, npm: lodash-amd, npm: lodash.unset

### Impact

Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the `_.unset` and `_.omit` functions. The fix for [CVE-2025-13465](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as `Object.prototype`, `Number.prototype`, and `String.prototype`.

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

### Patches

This issue is patched in 4.18.0.

### Workarounds

None. Upgrade to the patched version.

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GHSA-f23m-r3pf-42rh — lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`