{"apiVersion":"1.0","identifier":"CVE-2026-41159","description":"Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.6 and 11.15.0, Mermaid-s default configuration allows injecting CSS that applies outside of the Mermaid diagram via the fontFamily, themeCSS, and altFontFamily configuration options. The injected CSS exploits stylis-s & (scope reference) handling. :not(&) escapes the #mermaid-xxx automatic scoping, applying styles to all page elements. Global at-rules (@font-face, @keyframes, @counter-style) are also injectable as stylis hoists them to top level. This allows page defacement and DOM attribute exfiltration via CSS :has() selectors. This vulnerability is fixed in 10.9.6 and 11.15.0.","publishedAt":"2026-05-29T15:16:22","lastModifiedAt":"2026-07-21T12:10:00","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41159","cvssScore":5.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.00486,"riskScore":0.55,"affectedProduct":"Mermaid","affectedVersions":"cannotmatch","vulnerabilityType":"Package","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-41159","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-41159","en":"https://www.redsauce.net/en/cves/CVE-2026-41159","fr":"https://www.redsauce.net/fr/cves/CVE-2026-41159","pt":"https://www.redsauce.net/pt/cves/CVE-2026-41159","de":"https://www.redsauce.net/de/cves/CVE-2026-41159","sk":"https://www.redsauce.net/sk/cves/CVE-2026-41159","el":"https://www.redsauce.net/el/cves/CVE-2026-41159"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-41159"}}