{"id":"CVE-2026-44575","revision":null,"records":[{"revision":"f30723eba74d4fc7ae7f7fc05b63c8db","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44575","aliases":[],"title":"Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes","description":"Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.","state":0,"publishedAt":"2026-05-13T16:54:39.455+00:00","modifiedAt":"2026-08-13T12:04:21.797+00:00","affected":[{"ecosystem":"Vendor product","name":"next.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vercel\",\n                    \"product\": \"next.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 16.0.0, < 16.2.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 15.2.0, < 15.5.16\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44575","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44575","identifiers":["CVE-2026-44575"]},"retained":false,"historicalAffected":[]},{"revision":"56fe427c781f46beae8e38f3f742f19a","observedAt":"2026-11-07T10:31:25.835+00:00","statement":{"source":"euvd","id":"EUVD-2026-30059","aliases":["CVE-2026-44575","GHSA-267c-6grr-h53f"],"title":"Next.js is a React framework for building full-stack web applications. 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Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30059","identifiers":["EUVD-2026-30059","CVE-2026-44575","GHSA-267c-6grr-h53f"]},"retained":false,"historicalAffected":[]},{"revision":"7c708a032613450caeb7b0b489f022ce","observedAt":"2026-10-27T11:12:17.434+00:00","statement":{"source":"nvd","id":"CVE-2026-44575","aliases":[],"title":"Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through t…","description":"Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.","state":0,"publishedAt":"2026-05-13T17:16:22.907+00:00","modifiedAt":"2026-10-26T17:10:03.27+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"},{"system":"CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f","https://access.redhat.com/errata/RHSA-2026:34608","https://access.redhat.com/errata/RHSA-2026:37272","https://access.redhat.com/errata/RHSA-2026:40974","https://access.redhat.com/errata/RHSA-2026:54435","https://access.redhat.com/security/cve/CVE-2026-44575","https://bugzilla.redhat.com/show_bug.cgi?id=2477188","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44575.json"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44575","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-288","CWE-551"],"productCriteria":["cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-05-13T17:16:22.907","lastModified":"2026-10-26T17:10:03.270"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-44575","identifiers":["CVE-2026-44575"]},"retained":false,"historicalAffected":[]},{"revision":"6b649cd2011e4410be326f239bfa9bcd","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-267c-6grr-h53f","aliases":["CVE-2026-44575"],"title":"Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes","description":"### Impact\n\nApp Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted `.rsc` and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check.\n\n### Fix\n\nWe now include App Router transport variants when generating middleware matchers, so middleware protections are applied consistently to those requests as well as to the normal page URL.\n\n### Workarounds\n\nIf you cannot upgrade immediately, enforce authorization in the underlying route or page logic instead of relying solely on middleware.","state":0,"publishedAt":"2026-05-11T15:54:24+00:00","modifiedAt":"2026-09-10T03:51:03.9709007+00:00","affected":[{"ecosystem":"npm","name":"next","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"15.2.0"},{"kind":"fixed","version":"15.5.16"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"next","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"16.0.0"},{"kind":"fixed","version":"16.2.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f","https://nvd.nist.gov/vuln/detail/CVE-2026-44575","https://github.com/vercel/next.js","https://github.com/vercel/next.js/releases/tag/v15.5.16","https://github.com/vercel/next.js/releases/tag/v16.2.5"],"sourceUrl":"https://github.com/advisories/GHSA-267c-6grr-h53f","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-267c-6grr-h53f","identifiers":["GHSA-267c-6grr-h53f","CVE-2026-44575"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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