CVE-2026-59887
Published:July 08, 2026
Updated:August 03, 2026
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.
Affected Packages
https://github.com/markdown-it/linkify-it.git (GITHUB):
Affected version(s) >=0.1.0 <5.0.2Fix Suggestion:
Update to version 5.0.2linkify-it (NPM):
Affected version(s) >=0.1.0 <5.0.2Fix Suggestion:
Update to version 5.0.2linkify-it (NPM):
Affected version(s) >=0.1.0 <5.0.2Fix Suggestion:
Update to version 5.0.2Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity
EPSS
Base Score:
0.34