linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text

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Summary

CVECVE-2026-59887
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 17:17:26 UTC
Updated2026-07-08 17:17:26 UTC
Descriptionlinkify-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Markdown-it Linkify-it affected < 5.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm [email protected] github.com
github.com/markdown-it/linkify-it/releases/tag/5.0.2 [email protected] github.com
github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed20856... [email protected] github.com
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