{"id":"EUVD-2026-30051","revision":null,"records":[{"revision":"a63144d53a40406f8b99dc11f879d09c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44572","aliases":[],"title":"Next.js: Middleware / Proxy redirects can be cache-poisoned","description":"Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.","state":0,"publishedAt":"2026-05-13T15:57:15.75+00:00","modifiedAt":"2026-05-14T15:33:10.541+00:00","affected":[{"ecosystem":"Vendor product","name":"next.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vercel\",\n                    \"product\": \"next.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 12.2.0, < 15.5.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 16.0.0, < 16.2.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7,"severity":"LOW"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44572","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44572","identifiers":["CVE-2026-44572"]},"retained":false,"historicalAffected":[]},{"revision":"1322babbe5a445c7aa33b51cfd2f997d","observedAt":"2026-11-07T10:31:22.242+00:00","statement":{"source":"euvd","id":"EUVD-2026-30051","aliases":["CVE-2026-44572","GHSA-3g8h-86w9-wvmq"],"title":"Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirec…","description":"Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7,"severity":null}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30051","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 13, 2026, 3:57:15 PM","dateUpdated":"May 14, 2026, 3:33:10 PM"},"relatedAdvisories":[{"id":"WID-SEC-W-2026-1401","title":"Vercel Next.js: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2026-23870","CVE-2026-44572","CVE-2026-44573","CVE-2026-44574","CVE-2026-44575","CVE-2026-44576","CVE-2026-44577","CVE-2026-44578","CVE-2026-44579","CVE-2026-44580","CVE-2026-44581","CVE-2026-44582"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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-2026-30051","identifiers":["EUVD-2026-30051","CVE-2026-44572","GHSA-3g8h-86w9-wvmq"]},"retained":false,"historicalAffected":[]},{"revision":"c0fed82d60494a2d8d27bfc1f0a68c46","observedAt":"2026-10-27T11:12:17.434+00:00","statement":{"source":"nvd","id":"CVE-2026-44572","aliases":[],"title":"Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirec…","description":"Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.","state":0,"publishedAt":"2026-05-13T16:16:58.8+00:00","modifiedAt":"2026-10-26T18:10:00.173+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7,"severity":"LOW"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44572","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-349"],"productCriteria":["cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-05-13T16:16:58.800","lastModified":"2026-10-26T18:10:00.173"},"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-2026-44572","identifiers":["CVE-2026-44572"]},"retained":false,"historicalAffected":[]},{"revision":"c376c564bcd940759cfdc46482d176d3","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-3g8h-86w9-wvmq","aliases":["CVE-2026-44572"],"title":"Next.js's Middleware / Proxy redirects can be cache-poisoned","description":"### Impact\n\nNext.js uses the `x-nextjs-data` request header for internal data requests. On affected versions, an external client could send this header on a normal request to a path handled by middleware that returns a redirect.\n\nWhen that happened, the middleware/proxy could treat the request as a data request and replace the standard `Location` redirect header with the internal `x-nextjs-redirect` header. Browsers do not follow `x-nextjs-redirect`, so the response became an unusable redirect for normal clients.\n\nIf the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a `Location` header, causing a denial of service for that redirect path until the cache entry expired or was purged.\n\n### Affected scenarios\n\nThis affects applications that:\n- use middleware or proxy redirects\n- are deployed behind a caching CDN or reverse proxy\n- allow 3xx responses on those paths to be cached without differentiating internal data requests from normal requests\n\n### Fix\n\nThe fix stops trusting `x-nextjs-data` by itself for middleware redirect handling. A request is now treated as an internal data request only when it is validated as such by internal routing state, preserving legitimate data-request redirect behavior while preventing external header injection from changing normal redirect responses.\n\n### Workarounds\n\nBefore upgrading, users can reduce risk by:\n- configuring the CDN or reverse proxy to vary its cache key on `x-nextjs-data` for affected responses","state":0,"publishedAt":"2026-05-11T16:12:07+00:00","modifiedAt":"2026-09-10T03:51:04.4229546+00:00","affected":[{"ecosystem":"npm","name":"next","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.2.0"},{"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:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq","https://nvd.nist.gov/vuln/detail/CVE-2026-44572","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-3g8h-86w9-wvmq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3g8h-86w9-wvmq","identifiers":["GHSA-3g8h-86w9-wvmq","CVE-2026-44572"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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