Versions of deep-extend before 0.5.1 are vulnerable to prototype pollution.
Update to version 0.5.1 or later.
{
"nvd_published_at": null,
"severity": "CRITICAL",
"github_reviewed_at": "2020-06-16T21:40:53Z",
"github_reviewed": true,
"cwe_ids": [
"CWE-20"
]
}