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Vulnerabilities CVE-2026-71437

CVE-2026-71437

Medium
Open
TLP:CLEAR

Mermaid Architecture diagrams are vulnerable to prototype pollution

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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.

Details

CVSS Score
6.5
EPSS Score
0.29%

21.3th percentile

CVSS Vector
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
Confidence
90%
Published
Aug 6, 2026
Last Modified
Aug 7, 2026
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