{"cve":"CVE-2026-48801","nvd":{"published":"2026-07-14T21:17:01.247","modified":"2026-10-24T21:10:00.130","status":"Analyzed","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1333"],"references":["https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159","https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4","https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4"],"products":["markdown-it:linkify-it"],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-48801","score":0.00394,"percentile":0.3328,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-22p9-wv53-3rq4","url":"https://osv.dev/vulnerability/GHSA-22p9-wv53-3rq4","summary":"LinkifyIt#match scan loop has quadratic algorithmic complexity","modified":"2026-09-10T03:51:07.300156595Z","packages":[{"ecosystem":"npm","name":"linkify-it","purl":"pkg:npm/linkify-it","ranges":["<5.0.1"],"fixed":["5.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}