CVE-2026-59887

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:markdown-it:linkify-it:*:*:*:*:*:node.js:*:*

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) linkify-it es una biblioteca de reconocimiento de enlaces con soporte completo de Unicode. Antes de la versión 5.0.2, el validador del esquema mailto: utilizado por .test() y .match() puede ser invocado en cada ocurrencia de mailto: y escanear la entrada restante a través de src_email_name en lib/re.mjs, causando un consumo de CPU de O(n^2) en texto de usuario manipulado. Este problema está solucionado en la versión 5.0.2.

Information

Published : 2026-07-08 17:17

Updated : 2026-10-25 17:10

NVD link : CVE-2026-59887

Mitre link : CVE-2026-59887

CVE.ORG link : CVE-2026-59887

JSON object : View

Products Affected

markdown-it

linkify-it

CWE

CWE-407

Inefficient Algorithmic Complexity

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