CVE-2026-59887

EUVD-2026-42321
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 27.39%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
markdown-itlinkify-it
𝑥
< 5.0.2
CNA
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe
https://github.com/markdown-it/linkify-it/releases/tag/5.0.2
https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm
https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm