{"id":"CVE-2026-64647","sourceIdentifier":"security-advisories@github.com","published":"2026-07-27T19:17:21.627","lastModified":"2026-10-24T13:10:00.147","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This is only an issue when receiving request bodies with a content type charset other than UTF-8. For example, the UTF-16 byte sequences for 삃삃 and 섄섄 in the request body would share the same cache. This issue has been fixed in versions 15.5.21 and 16.2.11."},{"lang":"es","value":"Next.js es un framework de React para construir aplicaciones web full-stack. En las versiones 12.0.0 hasta la 15.5.20 y 16.0.0 hasta la 16.2.10, un fetch del lado del servidor con un cuerpo de solicitud puede devolver un cuerpo de respuesta en caché de una solicitud diferente a la misma URL pero con un cuerpo diferente. Datos confidenciales en el cuerpo de respuesta del POST se filtrarían entonces a solicitudes no autorizadas. Aunque la solicitud en sí misma no será desduplicada. Esto es solo un problema al recibir cuerpos de solicitud con un conjunto de caracteres (charset) de tipo de contenido diferente a UTF-8. Por ejemplo, las secuencias de bytes UTF-16 para ?? y ?? en el cuerpo de la solicitud compartirían la misma caché. Este problema ha sido solucionado en las versiones 15.5.21 y 16.2.11."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"vercel","product":"next.js","versions":[{"version":">= 13.0.0, < 15.5.21","status":"affected"},{"version":">= 16.0.0, < 16.2.11","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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":6.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","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:L/I:L/A:N","baseScore":5.4,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":2.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-27T19:27:08.369919Z","id":"CVE-2026-64647","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-116"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","versionStartIncluding":"13.0.0","versionEndExcluding":"15.5.21","matchCriteriaId":"A35AD882-35BE-4B3B-8BBC-11ED8E8E1336"},{"vulnerable":true,"criteria":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","versionStartIncluding":"16.0.0","versionEndExcluding":"16.2.11","matchCriteriaId":"841758BF-9324-4127-B087-6A8C1BADB389"}]}]}],"references":[{"url":"https://github.com/vercel/next.js/commit/025bf4a5f7b47fb7758c4ebf1c931a61c451c082","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/vercel/next.js/pull/96008","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/vercel/next.js/releases/tag/v15.5.21","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/vercel/next.js/releases/tag/v16.2.11","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/vercel/next.js/security/advisories/GHSA-4633-3j49-mh5q","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}