CVE-2026-72860

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In the custom-embedding branch the upstream response body is truncated to 200 bytes and returned to the caller whenever the upstream status is neither 2xx nor 401 nor 403, which discloses the beginning of internal responses, and the other validation types remain usable for blind internal port scanning through status and timing differences. The caller-supplied apiKey is forwarded to the internal destination as an Authorization Bearer header. 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That guard compares hostname strings only: it resolves no DNS, does not revalidate after a redirect, and its IPv4-mapped IPv6 branch is unreachable. The branch matches ^::ffff:(\\d+\\.\\d+\\.\\d+\\.\\d+)$, but the WHATWG URL parser canonicalizes such literals to hextets before the guard runs, so new URL(\"http://[::ffff:127.0.0.1]/\").hostname yields [::ffff:7f00:1] and the pattern is tested against a string it is never handed. Every IPv4-mapped address therefore passes, and http://[::ffff:7f00:1] and http://[::ffff:a9fe:a9fe] reach loopback and link-local metadata addresses; a hostname whose A record points at an internal address passes as well because no resolution occurs. In the custom-embedding branch the upstream response body is truncated to 200 bytes and returned to the caller whenever the upstream status is neither 2xx nor 401 nor 403, which discloses the beginning of internal responses, and the other validation types remain usable for blind internal port scanning through status and timing differences. The caller-supplied apiKey is forwarded to the internal destination as an Authorization Bearer header. 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The branch matches ^::ffff:(\\d+\\.\\d+\\.\\d+\\.\\d+)$, but the WHATWG URL parser canonicalizes such literals to hextets before the guard runs, so new URL(\"http://[::ffff:127.0.0.1]/\").hostname yields [::ffff:7f00:1] and the pattern is tested against a string it is never handed. Every IPv4-mapped address therefore passes, and http://[::ffff:7f00:1] and http://[::ffff:a9fe:a9fe] reach loopback and link-local metadata addresses; a hostname whose A record points at an internal address passes as well because no resolution occurs. In the custom-embedding branch the upstream response body is truncated to 200 bytes and returned to the caller whenever the upstream status is neither 2xx nor 401 nor 403, which discloses the beginning of internal responses, and the other validation types remain usable for blind internal port scanning through status and timing differences. The caller-supplied apiKey is forwarded to the internal destination as an Authorization Bearer header. A dashboard session is required by default, and none is required when requireLogin is disabled."}, {"lang": "es", "value": "La ruta POST /API/provider-nodes/validate en 9router toma una baseUrl proporcionada por el llamador y emite solicitudes HTTP del lado del servidor hacia ella, protegiendo el destino con assertPublicUrl de src/shared/utils/ssrfGuard.js. Ese guardia compara solo cadenas de nombre de host: no resuelve DNS, no revalida despu\u00e9s de una redirecci\u00f3n, y su rama IPv6 mapeada a IPv4 es inalcanzable. La rama coincide con ^::ffff:(\\d+\\.\\d+\\.\\d+\\.\\d+)$, pero el analizador de URL WHATWG canoniza dichos literales a hextetos antes de que se ejecute el guardia, por lo que new URL('http://[::ffff:127.0.0.1]/').hostname produce [::ffff:7f00:1] y el patr\u00f3n se prueba contra una cadena que nunca se le entrega. Por lo tanto, cada direcci\u00f3n mapeada a IPv4 pasa, y http://[::ffff:7f00:1] y http://[::ffff:a9fe:a9fe] alcanzan direcciones de metadatos de loopback y link-local; un nombre de host cuyo registro A apunta a una direcci\u00f3n interna tambi\u00e9n pasa porque no ocurre ninguna resoluci\u00f3n. En la rama de incrustaci\u00f3n personalizada, el cuerpo de la respuesta upstream se trunca a 200 bytes y se devuelve al llamador siempre que el estado upstream no sea 2xx ni 401 ni 403, lo que revela el comienzo de las respuestas internas, y los otros tipos de validaci\u00f3n siguen siendo utilizables para el escaneo ciego de puertos internos a trav\u00e9s de diferencias de estado y tiempo. La apiKey proporcionada por el llamador se reenv\u00eda al destino interno como un encabezado Authorization Bearer. Se requiere una sesi\u00f3n de panel de control por defecto, y no se requiere ninguna cuando requireLogin est\u00e1 deshabilitado."}], "id": "CVE-2026-72860", "lastModified": "2026-10-18T20:10:00.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 4.7, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72860", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T15:26:55.977320Z", "version": "2.0.3"}}]}, "published": "2026-08-20T22:18:05.787", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/decolua/9router"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/decolua/9router/blob/master/src/app/api/provider-nodes/validate/route.js"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/decolua/9router/blob/master/src/shared/utils/ssrfGuard.js"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/decolua/9router/issues/3293"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/decolua/9router/pull/3370"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/9router-server-side-request-forgery-via-api-provider-nodes-validate-because-the-ipv4-mapped-ipv6-denylist-check-is-unreachable"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/decolua/9router/issues/3293"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-184"}, {"lang": "en", "value": "CWE-918"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

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