{"id":"EUVD-2026-54242","revision":"a7f6b9cb4dd44bda8e45559e8b1781e9","records":[{"revision":"a7f6b9cb4dd44bda8e45559e8b1781e9","observedAt":"2026-10-30T11:50:56.94+00:00","statement":{"source":"euvd","id":"EUVD-2026-54242","aliases":["CVE-2026-71437","GHSA-3rrr-jr9j-h3q3"],"title":"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 wi…","description":"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 as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:H/SI:H/SA:H","score":6.5,"severity":null}],"references":["https://github.com/mermaid-js/mermaid/security/advisories/GHSA-3rrr-jr9j-h3q3","https://github.com/mermaid-js/mermaid/pull/8022","https://github.com/mermaid-js/mermaid/commit/99af3fc35ef0a9a9c8c6314521344d67523ddccf","https://github.com/mermaid-js/mermaid/releases/tag/mermaid@11.16.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-54242","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 6, 2026, 7:51:52 PM","dateUpdated":"Aug 7, 2026, 5:37:35 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-54242","identifiers":["EUVD-2026-54242","CVE-2026-71437","GHSA-3rrr-jr9j-h3q3"]},"retained":false,"historicalAffected":[]}],"coverage":[]}