{"cve":"CVE-2026-64647","nvd":{"published":"2026-07-27T19:17:21.627","modified":"2026-10-24T13:10:00.147","status":"Analyzed","description":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This is only an issue when receiving request bodies with a content type charset other than UTF-8. For example, the UTF-16 byte sequences for 삃삃 and 섄섄 in the request body would share the same cache. This issue has been fixed in versions 15.5.21 and 16.2.11.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","score":5.4},"cwes":["CWE-116"],"references":["https://github.com/vercel/next.js/commit/025bf4a5f7b47fb7758c4ebf1c931a61c451c082","https://github.com/vercel/next.js/pull/96008","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11","https://github.com/vercel/next.js/security/advisories/GHSA-4633-3j49-mh5q"],"products":["vercel:next.js"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-64647","score":0.00317,"percentile":0.24412,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-4633-3j49-mh5q","url":"https://osv.dev/vulnerability/GHSA-4633-3j49-mh5q","summary":"Next.js: Cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences","modified":"2026-09-10T03:50:51.390157243Z","packages":[{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=13.0.0 <15.5.21"],"fixed":["15.5.21"]},{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=16.0.0 <16.2.11"],"fixed":["16.2.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}