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CVE-2026-71437— Mermaid Architecture diagrams are vulnerable to prototype pollution

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 11.5.0版本至11.16.1之前版本存在输入验证错误漏洞，该漏洞源于架构图中分组ID未经验证直接用作对象属性键，可能导致原型污染，影响嵌入应用程序的行为。

CVSS 6.5 · Medium EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
mermaid-js mermaid >= 11.5.0, < 11.16.1 affected
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I. Basic Information for CVE-2026-71437

Vulnerability Information
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Vulnerability Title
Mermaid Architecture diagrams are vulnerable to prototype pollution
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 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. 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:L/UI:N/VC:N/VI:N/VA:L/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
mermaid-js mermaid 输入验证错误漏洞
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 11.5.0版本至11.16.1之前版本存在输入验证错误漏洞，该漏洞源于架构图中分组ID未经验证直接用作对象属性键，可能导致原型污染，影响嵌入应用程序的行为。
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 >= 11.5.0, < 11.16.1 -

II. Public POCs for CVE-2026-71437

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III. Intelligence Information for CVE-2026-71437

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Patches & Fixes for CVE-2026-71437 (1)

Vendor Advisories for CVE-2026-71437 (1)

Vendor Pages for CVE-2026-71437 (1)

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

CVE-2026-71439 5.3 MEDIUM Mermaid radar diagrams are vulnerable to DoS
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-1321

V. Comments for CVE-2026-71437

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