CVE-2026-41149
Published: May 22, 2026
Modified: May 23, 2026
Description
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and earlier, as well as 11.0.0-alpha.1 through 11.14.0, are vulnerable to HTML injection under the default configuration. Specifically, the classDef directive in Mermaid state diagrams permits DOM injection that escapes the SVG context. However, <script> tags are stripped, which prevents cross-site scripting (XSS). This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in a sandboxed <iframe>.
| Vendor | Product | Versions |
|---|---|---|
mermaid-js | mermaid | affected >= 11.0.0-alpha.1, < 11.15.0affected < 10.9.6 |
Weaknesses (CWE)
References
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