CVE-2026-59887

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.

PUBLISHED Reserved 2026-07-07 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-407: Inefficient Algorithmic Complexity

Product status

References

github.com/...ify-it/security/advisories/GHSA-v245-v573-v5vm exploit

github.com/...ify-it/security/advisories/GHSA-v245-v573-v5vm

github.com/...ommit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe

github.com/markdown-it/linkify-it/releases/tag/5.0.2

cve.org (CVE-2026-59887)

nvd.nist.gov (CVE-2026-59887)

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