{"id":"CVE-2026-64642","state":"PUBLISHED","title":"Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale","description":"Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.","publishedAt":"2026-07-27T17:45:40.761Z","updatedAt":"2026-07-28T15:20:33.639Z","severity":{"score":8.3,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["vercel next.js"],"affected":[{"vendor":"vercel","product":"next.js","versions":[{"version":">= 16.0.0, < 16.2.11","status":"affected"}]}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24","https://github.com/vercel/next.js/pull/96014","https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151","https://github.com/vercel/next.js/releases/tag/v16.2.11"],"weaknesses":["CWE-285"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64642.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64642","state":"PUBLISHED","datePublished":"2026-07-27T17:45:40.761Z","dateUpdated":"2026-07-28T15:20:33.639Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-20T17:11:30.895Z"},"containers":{"cna":{"title":"Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale","descriptions":[{"lang":"en","value":"Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11."}],"affected":[{"vendor":"vercel","product":"next.js","versions":[{"version":">= 16.0.0, < 16.2.11","status":"affected"}]}],"references":[{"url":"https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24","name":"https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/vercel/next.js/pull/96014","name":"https://github.com/vercel/next.js/pull/96014","tags":["x_refsource_MISC"]},{"url":"https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151","name":"https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151","tags":["x_refsource_MISC"]},{"url":"https://github.com/vercel/next.js/releases/tag/v16.2.11","name":"https://github.com/vercel/next.js/releases/tag/v16.2.11","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.3,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-27T17:45:40.761Z"},"source":{"advisory":"GHSA-6gpp-xcg3-4w24","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T15:07:35.483250Z","id":"CVE-2026-64642","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:20:33.639Z"}}]}}}