Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1.
{
"sources": [
{
"imported": "2026-08-12T15:35:15.447Z",
"id": "CVE-2021-41817",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-41817",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41817",
"modified": "2026-06-17T04:08:57.443Z",
"database_specific": {
"status": "Modified"
},
"published": "2022-01-01T05:15:08.197Z"
}
],
"license": "CC-BY-4.0"
}