Mermaid configuration APIs allow prototype pollution

Summary Mermaid's configuration setters mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig merge the caller-supplied configuration object into Mermaid's internal config using the assignWithDepth deep-merge helper that is vulnerable to prototype pollution. Because these APIs...

NPM: Mermaid configuration APIs allow prototype pollution

NPM: Mermaid configuration APIs allow prototype pollution vulnerability discovered by ? in WordPress Npm mermaid versions 10.9.8...

CVE-2026-71438

Mermaid (JavaScript) prior to versions 10.9.8 and 11.16.1 is vulnerable to prototype pollution via its configuration entry points mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig, which merge caller-supplied data into internal config using the assignWithDepth deep-merge h...

CVE-2026-71438

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 interna...

EUVD-2026-54244

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 interna...

CVE-2026-71438 Mermaid configuration APIs allow prototype pollution

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 interna...

NPM: Mermaid allows CSS injection applying to sibling elements of the diagram

NPM: Mermaid allows CSS injection applying to sibling elements of the diagram vulnerability discovered by ? in WordPress Npm mermaid versions 10.9.8...

Mermaid allows CSS injection applying to sibling elements of the diagram

Summary Mermaid does not fully restrict CSS to the rendered SVG subtree. Although selectors are prefixed with mermaid-X, sibling and + combinators can still escape the Mermaid container and inject styles to DOM elements adjacent to the diagram . Most users of mermaid would not be affected by this...

GHSA-6X64-9X62-F2GX Mermaid allows CSS injection applying to sibling elements of the diagram

Summary Mermaid does not fully restrict CSS to the rendered SVG subtree. Although selectors are prefixed with mermaid-X, sibling and + combinators can still escape the Mermaid container and inject styles to DOM elements adjacent to the diagram . Most users of mermaid would not be affected by this...

CVE-2026-50159

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 is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text c...

EUVD-2026-54243

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 is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text c...

CVE-2026-50159 Mermaid allows CSS injection applying to sibling elements of the diagram

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 is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text c...

CVE-2026-50159

Mermaid (JavaScript diagram tool) is affected by a CSS-injection vulnerability caused by sibling combinator selectors generated from diagram-supplied class or id names. The issue exists prior to Mermaid v10.9.8 and v11.16.1 and can allow an attacker who supplies diagram text to inject CSS into th...

Mermaid Architecture diagrams are vulnerable to prototype pollution

Rendering an untrusted architecture-beta diagram lets the diagram author write an arbitrary property with the value horizontal or vertical onto Object.prototype. A group id of proto is accepted as a valid parent. Impact Any code in the same realm that reads a property of that name from an arbitra...

GHSA-3RRR-JR9J-H3Q3 Mermaid Architecture diagrams are vulnerable to prototype pollution

Rendering an untrusted architecture-beta diagram lets the diagram author write an arbitrary property with the value horizontal or vertical onto Object.prototype. A group id of proto is accepted as a valid parent. Impact Any code in the same realm that reads a property of that name from an arbitra...

NPM: Mermaid Architecture diagrams are vulnerable to prototype pollution

NPM: Mermaid Architecture diagrams are vulnerable to prototype pollution vulnerability discovered by ? in WordPress Npm mermaid versions = 11.5.0, 11.16.1...

CVE-2026-71437

Mermaid.js architecture diagrams are affected by prototype pollution in versions 11.5.0–11.16.1. A diagram-defined group with id proto uses the id as an object property key, allowing pollution of Object.prototype and potentially affecting embedding applications. The issue is fixed in Mermaid v11....

CVE-2026-71437

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 ...

EUVD-2026-54242

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 ...

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

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 ...