CVE-2026-2833

{"id": "CVE-2026-2833", "cveTags": [], "metrics": {"cvssMetricV31": [{"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}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@cloudflare.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-05T00:15:57.650", "references": [{"url": "https://github.com/cloudflare/pingora", "tags": ["Product"], "source": "cna@cloudflare.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cna@cloudflare.com", "description": [{"lang": "en", "value": "CWE-444"}]}], "descriptions": [{"lang": "en", "value": "An HTTP request smuggling vulnerability (CWE-444) was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the backend has accepted the upgrade. An attacker can thus directly forward a malicious payload after a request with an Upgrade header to that backend in a way that may be interpreted as a subsequent request header, bypassing proxy-level security controls and enabling cross-user session hijacking.\n\nImpact\n\nThis vulnerability primarily affects standalone Pingora deployments where a Pingora proxy is exposed to external traffic. An attacker could exploit this to:\n\n * Bypass proxy-level ACL controls and WAF logic\n\n\n\n\n * Poison caches and upstream connections, causing subsequent requests from legitimate users to receive responses intended for smuggled requests\n\n\n\n\n * Perform cross-user attacks by hijacking sessions or smuggling requests that appear to originate from the trusted proxy IP\n\n\n\n\nCloudflare's CDN infrastructure was not affected by this vulnerability, as ingress proxies in the CDN stack maintain proper HTTP parsing boundaries and do not prematurely switch to upgraded connection forwarding mode.\n\n\nMitigation:\n\nPingora users should upgrade to Pingora v0.8.0 or higher\n\n\nAs a workaround, users may return an error on requests with the Upgrade header present in their request filter logic in order to stop processing bytes beyond the request header and disable downstream connection reuse."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad de contrabando de solicitudes HTTP (CWE-444) en el manejo de Pingora de las actualizaciones de conexi\u00f3n HTTP/1.1. El problema ocurre cuando un proxy de Pingora lee una solicitud que contiene un encabezado Upgrade, haciendo que el proxy pase el resto de los bytes de la conexi\u00f3n a un backend antes de que el backend haya aceptado la actualizaci\u00f3n. Un atacante puede as\u00ed reenviar directamente una carga \u00fatil maliciosa despu\u00e9s de una solicitud con un encabezado Upgrade a ese backend de una manera que puede ser interpretada como un encabezado de solicitud subsiguiente, eludiendo los controles de seguridad a nivel de proxy y permitiendo el secuestro de sesi\u00f3n entre usuarios.\n\nImpacto\n\nEsta vulnerabilidad afecta principalmente a implementaciones de Pingora independientes donde un proxy de Pingora est\u00e1 expuesto al tr\u00e1fico externo. Un atacante podr\u00eda explotar esto para:\n\n * Eludir los controles ACL a nivel de proxy y la l\u00f3gica WAF\n\n * Envenenar cach\u00e9s y conexiones ascendentes, haciendo que las solicitudes subsiguientes de usuarios leg\u00edtimos reciban respuestas destinadas a solicitudes de contrabando\n\n * Realizar ataques entre usuarios secuestrando sesiones o contrabandeando solicitudes que parecen originarse de la IP del proxy de confianza\n\nLa infraestructura CDN de Cloudflare no se vio afectada por esta vulnerabilidad, ya que los proxies de entrada en la pila CDN mantienen l\u00edmites de an\u00e1lisis HTTP adecuados y no cambian prematuramente al modo de reenv\u00edo de conexi\u00f3n actualizada.\n\nMitigaci\u00f3n:\n\nLos usuarios de Pingora deber\u00edan actualizar a Pingora v0.8.0 o superior\n\nComo soluci\u00f3n alternativa, los usuarios pueden devolver un error en solicitudes con el encabezado Upgrade presente en su l\u00f3gica de filtro de solicitudes para detener el procesamiento de bytes m\u00e1s all\u00e1 del encabezado de la solicitud y deshabilitar la reutilizaci\u00f3n de la conexi\u00f3n descendente."}], "lastModified": "2026-03-12T15:08:03.153", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7FD8B659-5061-46DA-8A73-2E17D6298546", "versionEndExcluding": "0.8.0"}], "operator": "OR"}]}], "sourceIdentifier": "cna@cloudflare.com"}