Versions 4.3.1 and earlier of semver are affected by a regular expression denial of service vulnerability when extremely long version strings are parsed.
Update to version 4.3.2 or later
{
"github_reviewed": true,
"severity": "HIGH",
"cwe_ids": [
"CWE-1333"
],
"nvd_published_at": null,
"github_reviewed_at": "2020-06-16T22:02:25Z"
}