{"id":"GHSA-m99w-x7hq-7vfj","summary":"Next.js: Denial of Service in App Router using Server Actions","details":"## 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. Applications using Pages Router or not using Server Actions are not vulnerable.","aliases":["CVE-2026-64641"],"modified":"2026-08-24T00:36:58.925653529Z","published":"2026-07-22T22:59:01Z","database_specific":{"github_reviewed_at":"2026-07-22T22:59:01Z","nvd_published_at":null,"cwe_ids":["CWE-834"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj"},{"type":"WEB","url":"https://github.com/vercel/next.js/pull/96013"},{"type":"WEB","url":"https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12"},{"type":"PACKAGE","url":"https://github.com/vercel/next.js"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v15.5.21"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v16.2.11"}],"affected":[{"package":{"name":"next","ecosystem":"npm","purl":"pkg:npm/next"},"ranges":[{"type":"SEMVER","events":[{"introduced":"13.0.0"},{"fixed":"15.5.21"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-m99w-x7hq-7vfj/GHSA-m99w-x7hq-7vfj.json"}},{"package":{"name":"next","ecosystem":"npm","purl":"pkg:npm/next"},"ranges":[{"type":"SEMVER","events":[{"introduced":"16.0.0"},{"fixed":"16.2.11"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-m99w-x7hq-7vfj/GHSA-m99w-x7hq-7vfj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}