CVE-2026-71438— Mermaid configuration APIs allow prototype pollution
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mermaid-js | mermaid | < 10.9.8 | affected |
>= 11.0.0-alpha.1, < 11.16.1 | affected |
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I. Basic Information for CVE-2026-71438
Vulnerability Information
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Vulnerability Title
Mermaid configuration APIs allow 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. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's internal config using the assignWithDepth deep-merge helper, which is vulnerable to prototype pollution. This is only exploitable if an application forwards untrusted data directly into one of these configuration entry points, which is outside their documented usage; diagram-supplied configuration (e.g. %%{init: {}}%% or YAML frontmatter) is not affected. 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:L/AC:L/AT:P/PR:H/UI:A/VC:N/VI:L/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 10.9.8之前版本和11.16.1之前版本存在输入验证错误漏洞，该漏洞源于配置setters使用assignWithDepth深度合并时容易受到原型污染攻击。
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 |
|---|---|---|---|---|
| mermaid-js | mermaid | < 10.9.8 | - |
II. Public POCs for CVE-2026-71438
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-71438 (1)
Vendor Advisories for CVE-2026-71438 (1)
Vendor Pages for CVE-2026-71438 (1)
- 🔗 Release mermaid@11.16.1 · mermaid-js/mermaid · GitHubx_refsource_MISC
Other References for CVE-2026-71438 (1)
- 🔗 Release v10.9.8 · mermaid-js/mermaid · GitHubx_refsource_MISC
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-2026-71436 | 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 |
IV. Related Vulnerabilities
Same product: mermaid
- CVE-2026-71439
Mermaid radar diagrams are vulnerable to DoS - CVE-2026-50159
Mermaid allows CSS injection applying to sibling elements of - CVE-2026-71437
Mermaid Architecture diagrams are vulnerable to prototype po - CVE-2026-71436
Mermaid XY Charts are vulnerable to an infinite loop DoS - CVE-2026-41150
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Same vendor: mermaid-js
- CVE-2026-71439
Mermaid radar diagrams are vulnerable to DoS - CVE-2026-50159
Mermaid allows CSS injection applying to sibling elements of - CVE-2026-71437
Mermaid Architecture diagrams are vulnerable to prototype po - CVE-2026-71436
Mermaid XY Charts are vulnerable to an infinite loop DoS - CVE-2026-41150
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Same weakness: CWE-1321
- CVE-2026-73654
Trigger.dev: Prototype pollution via run metadata operations - CVE-2026-73647
Quasar Framework: Prototype pollution in Quasar extend() uti - CVE-2026-73562
Mongoose: Prototype pollution in the update casting via __pr - CVE-2026-73088
Browserslist: Uncaught crash / prototype write via untrusted - CVE-2026-72769
n8n before 1.123.67 Prototype Pollution via VM Expression En
V. Comments for CVE-2026-71438
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