{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-08-02T00:25:01.417","vulnerabilities":[{"cve":{"id":"CVE-2026-2836","sourceIdentifier":"cna@cloudflare.com","published":"2026-03-05T00:15:58.053","lastModified":"2026-06-17T10:31:51.633","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction. The issue occurs because the default HTTP cache key implementation generates cache keys using only the URI path, excluding critical factors such as the host header (authority). Operators relying on the default are vulnerable to cache poisoning, and cross-origin responses may be improperly served to users.\n\n\nImpact\n\nThis vulnerability affects users of Pingora's alpha proxy caching feature who relied on the default CacheKey implementation. An attacker could exploit this for:\n\n  *  Cross-tenant data leakage: In multi-tenant deployments, poison the cache so that users from one tenant receive cached responses from another tenant\n\n\n  *  Cache poisoning attacks: Serve malicious content to legitimate users by poisoning shared cache entries\n\n\n\n\nCloudflare's CDN infrastructure was not affected by this vulnerability, as Cloudflare's default cache key implementation uses multiple factors to prevent cache key poisoning and never made use of the previously provided default.\n\n\nMitigation:\n\nWe strongly recommend Pingora users to upgrade to Pingora v0.8.0 or higher, which removes the insecure default cache key implementation. Users must now explicitly implement their own callback that includes appropriate factors such as Host header, origin server HTTP scheme, and other attributes their cache should vary on.\n\n\nPingora users on previous versions may also remove any of their default CacheKey usage and implement their own that should at minimum include the host header / authority and upstream peer’s HTTP scheme."},{"lang":"es","value":"Se ha encontrado una vulnerabilidad de envenenamiento de caché en la construcción predeterminada de clave de caché del framework de proxy HTTP Pingora. El problema ocurre porque la implementación predeterminada de clave de caché HTTP genera claves de caché usando solo la ruta URI, excluyendo factores críticos como el encabezado de host (autoridad). Los operadores que dependen del valor predeterminado son vulnerables al envenenamiento de caché, y las respuestas de origen cruzado pueden ser servidas incorrectamente a los usuarios.\n\nImpacto\n\nEsta vulnerabilidad afecta a los usuarios de la característica de almacenamiento en caché de proxy alfa de Pingora que dependían de la implementación predeterminada de CacheKey. Un atacante podría explotar esto para:\n\n  *  Fuga de datos entre inquilinos: En implementaciones multi-inquilino, envenenar la caché para que los usuarios de un inquilino reciban respuestas en caché de otro inquilino\n\n  *  Ataques de envenenamiento de caché: Servir contenido malicioso a usuarios legítimos envenenando entradas de caché compartidas\n\nLa infraestructura CDN de Cloudflare no se vio afectada por esta vulnerabilidad, ya que la implementación predeterminada de clave de caché de Cloudflare utiliza múltiples factores para prevenir el envenenamiento de clave de caché y nunca hizo uso del valor predeterminado proporcionado anteriormente.\n\nMitigación:\n\nRecomendamos encarecidamente a los usuarios de Pingora que actualicen a Pingora v0.8.0 o superior, lo que elimina la implementación predeterminada insegura de clave de caché. Los usuarios ahora deben implementar explícitamente su propia función de devolución de llamada que incluya factores apropiados como el encabezado Host, el esquema HTTP del servidor de origen y otros atributos en los que su caché debería variar.\n\nLos usuarios de Pingora en versiones anteriores también pueden eliminar cualquier uso de su CacheKey predeterminada e implementar la suya propia que debería incluir como mínimo el encabezado de host / autoridad y el esquema HTTP del par ascendente."}],"affected":[{"source":"cna@cloudflare.com","affectedData":[{"vendor":"Cloudflare","product":"https://github.com/cloudflare/pingora","defaultStatus":"unaffected","repo":"https://github.com/cloudflare/pingora","versions":[{"version":"0","lessThan":"0.8.0","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"cna@cloudflare.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-03-06T18:23:54.507163Z","id":"CVE-2026-2836","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-345"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:*","versionEndExcluding":"0.8.0","matchCriteriaId":"7FD8B659-5061-46DA-8A73-2E17D6298546"}]}]}],"references":[{"url":"https://github.com/cloudflare/pingora","source":"cna@cloudflare.com","tags":["Product"]}]}}]}