{"id":"CVE-2024-1899","aliases":["GHSA-rmmh-p597-ppvv"],"url":"https://o3.security/vulnerability/CVE-2024-1899","summary":"Showdownjs Denial of Service","details":"Showdownjs, versions <= 2.1.0, `anchors` subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input.","published":"2024-02-26T18:45:23.289Z","modified":"2026-08-12T03:51:15.580654101Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.008,"percentile":0.53417,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"showdown","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://www.tenable.com/security/research/tra-2024-05"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/1xxx/CVE-2024-1899.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-1899"},{"type":"PACKAGE","url":"https://github.com/showdownjs/showdown"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:15.580654101Z"}}