PT-2026-56502 · Markdown It · Linkify-It

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59887

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Weakness Enumeration

CWE-407

Related Identifiers

CVE-2026-59887

Affected Products

Linkify-It

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-59887 · Security Note
• https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe · Note
• https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm · Note
• https://github.com/markdown-it/linkify-it/releases/tag/5.0.2 · Note