GHSA-f23m-r3pf-42rh — lodash vulnerable to prototype pollution via array-path bypass in `_.unset`, `_.omit`, and `_.pullAt

2026-11-15T15:05:12.306611+00:00

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

### Impact

The `_.unset`, `_.omit`, and `_.pullAt` functions are vulnerable to prototype pollution. 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

The issue is patched from 4.18.0 to 4.18.1 depending on the package: `lodash`, `lodash-es`, and `lodash-amd` in 4.18.1, and the standalone `lodash.unset` and `lodash.omit` packages in 4.18.0.

### Workarounds

None. Upgrade to the patched version.

### References

- [CVE-2025-13465 / GHSA-xxjr-mmjv-4gpg](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) (original fix that this bypasses)

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GHSA-f23m-r3pf-42rh — lodash vulnerable to prototype pollution via array-path bypass in `_.unset`, `_.omit`, and `_.pullAt