CVE-2026-71437

MediumCVSS 6.5/10Last modified Oct 24, 2026

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.

Metrics

CVSS 4.0 6.5/10CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-1321

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
mermaid-jsmermaid>= 11.5.0, < 11.16.1

References

Timeline

Published
Aug 6, 2026
Last modified
Oct 24, 2026
NVD status
Awaiting Analysis

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