CVE-2026-59887
Last modified
CVE-2026-59887 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| markdown-it | linkify-it | < 5.0.2 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-59887?
How severe is CVE-2026-59887?
How do I fix CVE-2026-59887?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-59881AIOHTTP is an asynchronous HTTP client/server framework for …6.9
- CVE-2026-59882guzzlehttp/psr7 is a PSR-7 HTTP message library implementati…6.5
- CVE-2026-59883Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, Co…6.1
- CVE-2026-59884pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4…7.5
- CVE-2026-59885pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4…7.5
- CVE-2026-59886pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4…7.5
- CVE-2026-59888jackson-databind contains the general-purpose data-binding f…6.5
- CVE-2026-59889jackson-databind contains the general-purpose data-binding f…6.5
- CVE-2026-5989A flaw has been found in Tenda F451 1.0.0.7. Affected is the…8.8
- CVE-2026-59890setuptools is a package that allows users to download, build…6.1
- CVE-2026-59891sigstore-js provides JavaScript libraries for interacting wi…9.6
- CVE-2026-59892OpenTelemetry JavaScript is the OpenTelemetry JavaScript cli…7.5
Are you affected by CVE-2026-59887?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST