CVE-2026-33131

{"id": "CVE-2026-33131", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "published": "2026-03-20T11:18:02.700", "references": [{"url": "https://github.com/h3js/h3/security/advisories/GHSA-3vj8-jmxq-cgj5", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-290"}]}], "descriptions": [{"lang": "en", "value": "H3 is a minimal H(TTP) framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl (which extends FastURL) which allows middleware bypass. When event.url, event.url.hostname, or event.url._url is accessed, such as in a logging middleware, the _url getter constructs a URL from untrusted data, including the user-controlled Host header. Because H3's router resolves the route handler before middleware runs, an attacker can supply a crafted Host header (e.g., Host: localhost:3000/abchehe?) to make the middleware path check fail while the route handler still matches, effectively bypassing authentication or authorization middleware. This affects any application built on H3 (including Nitro/Nuxt) that accesses event.url properties in middleware guarding sensitive routes. The issue requires an immediate fix to prevent FastURL.href from being constructed with unsanitized, attacker-controlled input. Version 2.0.1-rc.15 contains a patch for this issue."}, {"lang": "es", "value": "H3 es un framework H(TTP) m\u00ednimo. Las versiones 2.0.0-0 hasta 2.0.1-rc.14 contienen una vulnerabilidad de suplantaci\u00f3n de encabezado Host en NodeRequestUrl (que extiende FastURL) que permite el bypass de middleware. Cuando se accede a event.url, event.url.hostname, o event.url._url, como en un middleware de registro, el gestor de acceso _url construye una URL a partir de datos no confiables, incluyendo el encabezado Host controlado por el usuario. Debido a que el router de H3 resuelve el gestor de ruta antes de que se ejecute el middleware, un atacante puede proporcionar un encabezado Host manipulado (p. ej., Host: localhost:3000/abchehe?) para hacer que la verificaci\u00f3n de ruta del middleware falle mientras el gestor de ruta a\u00fan coincide, eludiendo efectivamente el middleware de autenticaci\u00f3n o autorizaci\u00f3n. Esto afecta a cualquier aplicaci\u00f3n construida sobre H3 (incluyendo Nitro/Nuxt) que acceda a las propiedades de event.url en middleware que protege rutas sensibles. El problema requiere una soluci\u00f3n inmediata para evitar que FastURL.href se construya con entrada no saneada y controlada por el atacante. La versi\u00f3n 2.0.1-rc.15 contiene un parche para este problema."}], "lastModified": "2026-03-20T19:45:14.473", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:h3:h3:2.0.0:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "A80DE960-665D-4590-B6D5-645099B808E2"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc10:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "603A08FC-B20B-4693-90A1-0BF5F08B43AC"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc11:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "BCC5ECF0-0EED-48BC-95FA-1D2671A971A9"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc12:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "BCCBE75E-DCF6-45FD-B57E-F8E2ADE3129F"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc13:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "3B66082C-3F3E-4BC6-9543-A2F9CFE3AAC6"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc14:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "3D1C9D7B-3CE4-427B-93B4-EAF867159AFB"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "C5E7779A-00CA-45E7-8F68-1DAB5388ED4A"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "064C21F5-8633-45F3-9A3D-3FB029A867B9"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "DDBC1DFD-8063-4AE1-92D8-B3B33735FEF0"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "496314A3-8F2B-4274-9D0D-7F11E896FEA5"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "35F49342-D52C-4762-9369-F380C5E7E0B5"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "D11CA1A7-3141-46EA-9687-32C333FC7B0C"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "A4A6FD03-5DE5-4D73-9FF3-BB653302C60B"}, {"criteria": "cpe:2.3:a:h3:h3:2.0.1:rc9:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "5E404148-6862-44F5-961D-10E8A742A4B6"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}