CVE-2026-59887 — linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text
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: oc…
Published: 2026-07-08 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7