CVE-2026-41149 – Mermaid: Improper sanitization of `classDef` in state diagrams leads to HTML injection

CVE ID :CVE-2026-41149

Published : May 22, 2026, 10:34 p.m. | 1 hour, 23 minutes ago

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,