{"id":"CVE-2026-59887","aliases":["GHSA-v245-v573-v5vm"],"url":"https://o3.security/vulnerability/CVE-2026-59887","summary":"linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text","details":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.","published":"2026-07-08T15:58:12.114Z","modified":"2026-08-12T03:51:29.068668732Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"linkify-it","fixedVersion":"5.0.2"}],"fix":{"url":"https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe","label":"markdown-it/linkify-it@105e5d7"},"references":[{"type":"WEB","url":"https://github.com/markdown-it/linkify-it/releases/tag/5.0.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59887.json"},{"type":"ADVISORY","url":"https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59887"},{"type":"FIX","url":"https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:29.068668732Z"}}