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CVE-2026-48801— linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop

Quick assessment

Affected
markdown-it linkify-it
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Markdown it! linkify-it是Markdown it!组织开源的一款协议解析与链接识别工具。 Markdown it linkify-it 5.0.1之前版本存在资源管理错误漏洞，该漏洞源于JavaScript级扫描循环在包含大量模糊链接或电子邮件的输入上具有O(N²)算法复杂度，可能导致同步渲染不可信Markdown的服务遭受工作进程拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
markdown-it linkify-it < 5.0.1 affected
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I. Basic Information for CVE-2026-48801

Vulnerability Information
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Vulnerability Title
linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Markdown it linkify-it 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Markdown it! linkify-it是Markdown it!组织开源的一款协议解析与链接识别工具。 Markdown it linkify-it 5.0.1之前版本存在资源管理错误漏洞，该漏洞源于JavaScript级扫描循环在包含大量模糊链接或电子邮件的输入上具有O(N²)算法复杂度，可能导致同步渲染不可信Markdown的服务遭受工作进程拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
markdown-it linkify-it < 5.0.1 -

II. Public POCs for CVE-2026-48801

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III. Intelligence Information for CVE-2026-48801

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Patches & Fixes for CVE-2026-48801 (1)

Vendor Advisories for CVE-2026-48801 (1)

IV. Related Vulnerabilities

Same product: linkify-it
Same vendor: markdown-it
Same weakness: CWE-1333

V. Comments for CVE-2026-48801

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