{"id":"GHSA-rmmh-p597-ppvv","summary":"Showdown vulnerable to Regular Expression Denial of Service (ReDoS) in link/anchor parsing","details":"Showdownjs, versions \u003c= 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.","aliases":["CVE-2024-1899"],"modified":"2026-09-10T03:50:09.886621379Z","published":"2024-02-26T21:31:36Z","database_specific":{"cwe_ids":["CWE-674","CWE-777"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-04-24T20:36:01Z","nvd_published_at":"2024-02-26T19:15:07Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-1899"},{"type":"PACKAGE","url":"https://github.com/showdownjs/showdown"},{"type":"WEB","url":"https://www.tenable.com/security/research/tra-2024-05"}],"affected":[{"package":{"name":"showdown","ecosystem":"npm","purl":"pkg:npm/showdown"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"2.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/02/GHSA-rmmh-p597-ppvv/GHSA-rmmh-p597-ppvv.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}