{"id":"CVE-2026-41149","title":"Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts","summary":"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 configurat…","severity":"none","cwe":["CWE-94"],"published":"2026-05-22","updated":"2026-07-23","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41149","references":[{"url":"https://github.com/mermaid-js/mermaid/commit/37ff937f1da2e19f882fd1db01235db4d01f4056","label":"security-advisories@github.com"},{"url":"https://github.com/mermaid-js/mermaid/commit/4e2d512bf5bf6f9de1a8f0a48da78dc4d09ac4f3","label":"security-advisories@github.com"},{"url":"https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr","label":"security-advisories@github.com"},{"url":"https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00401,"epssPercentile":0.34118,"ingestedAt":"2026-07-23T11:17:34.737Z","slug":"CVE-2026-41149","body":"## Overview\n\nMermaid 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>.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}