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This issue has been fixed in versions 15.5.21 and 16.2.11.","state":0,"publishedAt":"2026-07-27T17:40:01.137+00:00","modifiedAt":"2026-07-27T18:54:59.134+00:00","affected":[{"ecosystem":"Vendor product","name":"next.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vercel\",\n                    \"product\": \"next.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 13.0.0, < 15.5.21\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 16.0.0, < 16.2.11\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj","https://github.com/vercel/next.js/pull/96013","https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64641","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64641","identifiers":["CVE-2026-64641"]},"retained":false,"historicalAffected":[]},{"revision":"5599d760db7145f2b0cbd4484f73bc84","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-64641","aliases":[],"title":"Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead …","description":"Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. This issue has been fixed in versions 15.5.21 and 16.2.11.","state":0,"publishedAt":"2026-07-27T18:16:58.85+00:00","modifiedAt":"2026-10-24T13:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.2,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12","https://github.com/vercel/next.js/pull/96013","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-m99w-x7hq-7vfj"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64641","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-834"],"productCriteria":["cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-07-27T18:16:58.850","lastModified":"2026-10-24T13:10:00.147"},"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-2026-64641","identifiers":["CVE-2026-64641"]},"retained":false,"historicalAffected":[]},{"revision":"c5b02b2e985d433295d60aac652073f6","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-m99w-x7hq-7vfj","aliases":["CVE-2026-64641"],"title":"Next.js: Denial of Service in App Router using Server Actions","description":"## Impact\n\nCrafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process.\n\n## Workarounds\n\nNo workaround exists besides upgrading. 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