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CVE-2026-71439— Mermaid radar diagrams are vulnerable to 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 11.6.0版本至11.16.1之前版本存在安全漏洞，该漏洞源于对ticks参数验证不当，允许任意大值，可能导致高CPU使用率并冻结渲染网页或JavaScript进程，甚至因内存耗尽而终止进程。

CVSS 5.3 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
mermaid-js mermaid >= 11.6.0, < 11.16.1 affected
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I. Basic Information for CVE-2026-71439

Vulnerability Information
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Vulnerability Title
Mermaid radar diagrams are vulnerable to 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 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 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
循环条件输入未经检查
Source: CVE Program / CVE List V5
Vulnerability Title
mermaid-js mermaid 处理逻辑错误漏洞
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 11.6.0版本至11.16.1之前版本存在安全漏洞，该漏洞源于对ticks参数验证不当，允许任意大值，可能导致高CPU使用率并冻结渲染网页或JavaScript进程，甚至因内存耗尽而终止进程。
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 >= 11.6.0, < 11.16.1 -

II. Public POCs for CVE-2026-71439

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III. Intelligence Information for CVE-2026-71439

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Patches & Fixes for CVE-2026-71439 (2)

Vendor Advisories for CVE-2026-71439 (1)

Vendor Pages for CVE-2026-71439 (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-2026-71436 5.3 MEDIUM Mermaid XY Charts are vulnerable to an infinite loop 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-606

V. Comments for CVE-2026-71439

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