CVE-2026-29057

{"id": "CVE-2026-29057", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "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": "2026-03-18T01:16:05.443", "references": [{"url": "https://github.com/vercel/next.js/commit/dc98c04f376c6a1df76ec3e0a2d07edf4abdabd6", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/vercel/next.js/releases/tag/v15.5.13", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/vercel/next.js/releases/tag/v16.1.7", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/vercel/next.js/security/advisories/GHSA-ggv3-7p47-pfv8", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-444"}]}], "descriptions": [{"lang": "en", "value": "Next.js is a React framework for building full-stack web applications. Starting in version 9.5.0 and prior to versions 15.5.13 and 16.1.7, when Next.js rewrites proxy traffic to an external backend, a crafted `DELETE`/`OPTIONS` request using `Transfer-Encoding: chunked` could trigger request boundary disagreement between the proxy and backend. This could allow request smuggling through rewritten routes. An attacker could smuggle a second request to unintended backend routes (for example, internal/admin endpoints), bypassing assumptions that only the configured rewrite destination/path is reachable. This does not impact applications hosted on providers that handle rewrites at the CDN level, such as Vercel. The vulnerability originated in an upstream library vendored by Next.js. It is fixed in Next.js 15.5.13 and 16.1.7 by updating that dependency\u2019s behavior so `content-length: 0` is added only when both `content-length` and `transfer-encoding` are absent, and `transfer-encoding` is no longer removed in that code path. If upgrading is not immediately possible, block chunked `DELETE`/`OPTIONS` requests on rewritten routes at the edge/proxy, and/or enforce authentication/authorization on backend routes."}, {"lang": "es", "value": "Next.js es un framework de React para construir aplicaciones web full-stack. A partir de la versi\u00f3n 9.5.0 y antes de las versiones 15.5.13 y 16.1.7, cuando Next.js reescribe el tr\u00e1fico de proxy a un backend externo, una solicitud 'DELETE'/'OPTIONS' manipulada utilizando 'Transfer-Encoding: chunked' podr\u00eda desencadenar un desacuerdo en el l\u00edmite de la solicitud entre el proxy y el backend. Esto podr\u00eda permitir el contrabando de solicitudes a trav\u00e9s de rutas reescritas. Un atacante podr\u00eda contrabandear una segunda solicitud a rutas de backend no intencionadas (por ejemplo, endpoints internos/de administraci\u00f3n), eludiendo las suposiciones de que solo el destino/ruta de reescritura configurado es accesible. Esto no tiene impacto en las aplicaciones alojadas en proveedores que manejan las reescrituras a nivel de CDN, como Vercel. La vulnerabilidad se origin\u00f3 en una biblioteca upstream distribuida por Next.js. Se solucion\u00f3 en Next.js 15.5.13 y 16.1.7 actualizando el comportamiento de esa dependencia para que 'content-length: 0' se a\u00f1ada solo cuando tanto 'content-length' como 'transfer-encoding' est\u00e9n ausentes, y 'transfer-encoding' ya no se elimine en esa ruta de c\u00f3digo. Si la actualizaci\u00f3n no es posible de inmediato, bloquee las solicitudes 'DELETE'/'OPTIONS' chunked en las rutas reescritas en el borde/proxy, y/o aplique autenticaci\u00f3n/autorizaci\u00f3n en las rutas de backend."}], "lastModified": "2026-03-18T19:49:19.633", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "3B8FAC2E-2C02-4B2A-A3B8-50906BE0973F", "versionEndExcluding": "15.5.13", "versionStartIncluding": "9.5.0"}, {"criteria": "cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "A8325BCC-0497-4676-8397-676E2E3A80A2", "versionEndExcluding": "16.1.7", "versionStartIncluding": "16.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}