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.
| Vendor | Product | Versions |
|---|---|---|
| — | lodash | npm/lodash: <= 4.17.23, npm/lodash-es: <= 4.17.23, npm/lodash-amd: <= 4.17.23, npm/lodash.unset: >= 4.0.0, < 4.18.0 |
Downstream vendors/products affected by this vulnerability
| Vendor | Product | Source | Confidence |
|---|---|---|---|
| npm | lodash-amd | GHSA | 85% |
| npm | lodash.unset | GHSA | 85% |
| npm | lodash-es | GHSA | 85% |
