Vulnerability record · CVE-2026-59887 · published 8 July 2026
CVE-2026-59887: Markdown-it linkify-it vulnerability
MMarkdown It · Linkify It
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.
Description
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| 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 | ExploitMitigationVendor Advisory |
| https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm | ExploitMitigationVendor Advisory |
Track CVE-2026-59887 inside VULONE
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Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2026-59887), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
