{"id":"CVE-2026-44572","sourceIdentifier":"security-advisories@github.com","published":"2026-05-13T16:16:58.800","lastModified":"2026-06-17T10:50:48.920","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"vercel","product":"next.js","versions":[{"version":">= 12.2.0, < 15.5.16","status":"affected"},{"version":">= 16.0.0, < 16.2.5","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":3.7,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":2.2,"impactScore":1.4},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-14T15:32:48.568772Z","id":"CVE-2026-44572","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-349"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","versionStartIncluding":"12.2.0","versionEndExcluding":"15.5.16","matchCriteriaId":"31A12CFA-9A52-4285-B5F3-E5FAD69DF477"},{"vulnerable":true,"criteria":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","versionStartIncluding":"16.0.0","versionEndExcluding":"16.2.5","matchCriteriaId":"27C5CF7A-7A33-4BE4-B8FD-10BFD813204A"}]}]}],"references":[{"url":"https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}