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CVE-2026-71436— Mermaid XY Charts are vulnerable to an infinite loop DoS

Quick assessment

Affected
mermaid-js mermaid
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.

mermaid-js Mermaid是mermaid-js社区开源的一款通过文本定义图表的图表绘制工具。 mermaid-js mermaid 10.6.0版本至10.9.8之前版本和11.0.0-alpha.1版本至11.16.1之前版本存在资源管理错误漏洞，该漏洞源于setXAxisRangeData函数在配置X轴时使用无效参数导致无限循环，可导致拒绝服务，使页面或JavaScript进程因内存耗尽而崩溃。

CVSS 5.3 · Medium EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
mermaid-js mermaid >= 10.6.0, < 10.9.8 affected
>= 11.0.0-alpha.1, < 11.16.1 affected
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I. Basic Information for CVE-2026-71436

Vulnerability Information
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Vulnerability Title
Mermaid XY Charts are vulnerable to an infinite loop DoS
Source: CVE Program / CVE List V5
Vulnerability Description
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 10.6.0 until 10.9.8 and 11.16.1, Mermaid XY Charts are vulnerable to an infinite loop denial of service in the setXAxisRangeData function when configuring an X-Axis with invalid parameters. Because each loop iteration appends an element to an array, this generally causes a RangeError to appear after a few seconds, but it may instead cause the page or JavaScript process to crash from memory exhaustion, depending on the environment. This issue is fixed in versions 10.9.8 and 11.16.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
mermaid-js mermaid 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mermaid-js Mermaid是mermaid-js社区开源的一款通过文本定义图表的图表绘制工具。 mermaid-js mermaid 10.6.0版本至10.9.8之前版本和11.0.0-alpha.1版本至11.16.1之前版本存在资源管理错误漏洞，该漏洞源于setXAxisRangeData函数在配置X轴时使用无效参数导致无限循环，可导致拒绝服务，使页面或JavaScript进程因内存耗尽而崩溃。
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
mermaid-js mermaid >= 10.6.0, < 10.9.8 -

II. Public POCs for CVE-2026-71436

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III. Intelligence Information for CVE-2026-71436

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Patches & Fixes for CVE-2026-71436 (2)

Vendor Advisories for CVE-2026-71436 (1)

Vendor Pages for CVE-2026-71436 (1)

Other References for CVE-2026-71436 (1)

Same Patch Batch · mermaid-js · 2026-08-06 · 5 CVEs total

CVE-2026-71437 6.5 MEDIUM Mermaid Architecture diagrams are vulnerable to prototype pollution
CVE-2026-71439 5.3 MEDIUM Mermaid radar diagrams are vulnerable to DoS
CVE-2026-50159 5.3 MEDIUM Mermaid allows CSS injection applying to sibling elements of the diagram
CVE-2026-71438 2.4 LOW Mermaid configuration APIs allow prototype pollution

IV. Related Vulnerabilities

Same product: mermaid
Same vendor: mermaid-js
Same weakness: CWE-835

V. Comments for CVE-2026-71436

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