CVE-2026-59887

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.

• CWE-407

• https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffePatch
• https://github.com/markdown-it/linkify-it/releases/tag/5.0.2Release Notes
• https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vmExploit, Mitigation, Vendor Advisory
• https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vmExploit, Mitigation, Vendor Advisory

Published

Jul 8, 2026

Last Modified

Aug 26, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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