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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe Patch
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm Exploit, Mitigation, Vendor Advisory
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · markdown-itNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:markdown-it:linkify-it:*:*:*:*:*:node.js:*:*
References 4
- https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe Patch
- https://github.com/markdown-it/linkify-it/releases/tag/5.0.2 Release Notes
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm Exploit, Mitigation, Vendor Advisory
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm Exploit, Mitigation, Vendor Advisory