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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-71437)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-71437)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
445750	SCA: security update for mermaid (GHSA-3rrr-jr9j-h3q3)	Tenable Cloud Security	SCA Checks	medium
445750	SCA: security update for mermaid (GHSA-3rrr-jr9j-h3q3)	Tenable Self-Hosted Container Security	SCA Checks	medium
333314	Linux Distros Unpatched Vulnerability : CVE-2026-71437	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-71437

medium

Tenable Plugins

medium

medium

medium