CVE-2026-48801 — linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop
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 complexit…
Published: 2026-07-14 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7