CVE-2026-48801
Last modified
CVE-2026-48801 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 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
Description
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Markdown-It | Linkify-It | < 5.0.1 |
References
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4Exploit, Vendor Advisory
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-48801?
How severe is CVE-2026-48801?
How do I fix CVE-2026-48801?
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-2026-48794Authelia is an open-source authentication and authorization …1.3
- CVE-2026-48795AdonisJS is a TypeScript-first web framework. From 10.1.3 un…8.6
- CVE-2026-48797Backpropagate is a Python library for fine-tuning large lang…9.3
- CVE-2026-48799Postiz is an AI social media scheduling tool. Prior to 2.21.…7.7
- CVE-2026-4880The Barcode Scanner (+Mobile App) – Inventory manager, Order…9.8
- CVE-2026-48800Notepad++ is a free and open-source source code editor. Prio…7.8
- CVE-2026-48802python-engineio is a Python implementation of the Engine.IO …7.5
- CVE-2026-48804python-socketio is a Python implementation of the Socket.IO …7.5
- CVE-2026-48805Twig is a template language for PHP. Prior to 3.27.0, deprec…9.1
- CVE-2026-48806Twig is a template language for PHP. Prior to 3.27.0, ArrayE…9.1
- CVE-2026-48807Twig is a template language for PHP. Prior to 3.27.0, the sa…9.1
- CVE-2026-48808Twig is a template language for PHP. Prior to 3.27.0, the co…7.5
Are you affected by CVE-2026-48801?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST