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The Node.js package markdown-it, specifically its linkify-it component prior to version 5.0.1, contains an algorithmic complexity vulnerability in the LinkifyIt.prototype.match function. This function exhibits O(N²) complexity when processing inputs with many fuzzy links or emails due to repeated rescanning of progressively shorter input tails. This can lead to denial of service (DoS) conditions if untrusted Markdown with linkify enabled is synchronously rendered on a request hot path. The issue is resolved in version 5.0.1. Join the discussion | GCVE Database | 07/14/2026, 21:17:00 UTC Added: 06/26/2026, 22:04:26 UTC |
0 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. Join the discussion | CVE Database V5 | 07/08/2026, 15:58:12 UTC Added: 07/08/2026, 16:29:08 UTC |
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