{"id":"CVE-2026-48801","aliases":["GHSA-22p9-wv53-3rq4"],"url":"https://o3.security/vulnerability/CVE-2026-48801","summary":"linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop","details":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.","published":"2026-07-14T20:03:56.430Z","modified":"2026-08-12T03:51:40.860087555Z","cvss":null,"epss":{"score":0.00366,"percentile":0.29312,"asOf":"2026-08-25"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"linkify-it","fixedVersion":"5.0.1"}],"fix":{"url":"https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159","label":"markdown-it/linkify-it@6be6d15"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48801.json"},{"type":"ADVISORY","url":"https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48801"},{"type":"FIX","url":"https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.860087555Z"}}