CVE-2026-41149
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>.
- Affected products
- Mermaid, Node-Mermaid
- Fix
- Available
- CVSS 4.0
- 5.3 MEDIUM
- EPSS
- 0.4% (33th percentile)
- Weakness
- CWE-94
- NVD status
- Deferred
- Published
- 2026-05-22
No indexed exploits for CVE-2026-41149 yet
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