{"id":"GHSA-68g3-v927-f742","summary":"Next.js: Cache confusion of response bodies for requests with bodies","details":"## Impact\n\nA 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.\n\nThis only applies to `fetch` calls with a request that has a different init than the one passed to `fetch`.\nSafe: `fetch(new Request(init), init)`\nUnsafe: `fetch(new Request(init), aDifferentInit)`\n\n## Workarounds\n\nNo workaround exists besides upgrading. Applications using Pages Router are not vulnerable.","aliases":["CVE-2026-64648"],"modified":"2026-07-22T23:25:39.101925Z","published":"2026-07-22T23:08:17Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-07-22T23:08:17Z","nvd_published_at":null,"cwe_ids":["CWE-524"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/vercel/next.js/security/advisories/GHSA-68g3-v927-f742"},{"type":"WEB","url":"https://github.com/vercel/next.js/commit/062f66700b52a5d6bba2c0605d55577ab7ad262c"},{"type":"WEB","url":"https://github.com/vercel/next.js/commit/73b94872bc343d09494b50394d8c08eb9fc8e56a"},{"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-68g3-v927-f742/GHSA-68g3-v927-f742.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-68g3-v927-f742/GHSA-68g3-v927-f742.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}]}