{"id":"GHSA-vfv6-92ff-j949","summary":"Next.js vulnerable to cache poisoning via collisions in React Server Component cache-busting","details":"### Impact\n\nReact Server Component responses can be vulnerable to cache poisoning in deployments that rely on shared caches with insufficient response partitioning. In affected conditions, collisions in the `_rsc` cache-busting value can allow an attacker to poison cache entries so users receive the wrong response variant for a given URL.\n\n### Fix\n\nWe strengthened the `_rsc` cache-busting mechanism to make practical collisions significantly harder and to better separate response variants that should not share cache entries.\n\n### Workarounds\n\nIf you cannot upgrade immediately, ensure intermediary caches correctly honor `Vary` for RSC-related request headers, or disable shared caching for affected RSC responses until you can deploy a patched release.","aliases":["CVE-2026-44582"],"modified":"2026-07-17T21:15:11.060440934Z","published":"2026-05-11T15:56:48Z","database_specific":{"cwe_ids":["CWE-328"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-05-11T15:56:48Z","nvd_published_at":"2026-05-13T18:16:19Z"},"references":[{"type":"WEB","url":"https://github.com/vercel/next.js/security/advisories/GHSA-vfv6-92ff-j949"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44582"},{"type":"PACKAGE","url":"https://github.com/vercel/next.js"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v15.5.16"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v16.2.5"}],"affected":[{"package":{"name":"next","ecosystem":"npm","purl":"pkg:npm/next"},"ranges":[{"type":"SEMVER","events":[{"introduced":"13.4.6"},{"fixed":"15.5.16"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-vfv6-92ff-j949/GHSA-vfv6-92ff-j949.json"}},{"package":{"name":"next","ecosystem":"npm","purl":"pkg:npm/next"},"ranges":[{"type":"SEMVER","events":[{"introduced":"16.0.0"},{"fixed":"16.2.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-vfv6-92ff-j949/GHSA-vfv6-92ff-j949.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}