{"id":"CVE-2026-64648","title":"next: Next.js: Information disclosure via server-side fetch cache (CVE-2026-64648)","summary":"A flaw was found in Next.js. A remote attacker could exploit a vulnerability in the server-side fetch mechanism, where a request with a body might receive a cached response intended for a different request to the same URL but different bod…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"vendor","cwe":"CWE-524","vendor":"Red Hat","product":"Red Hat Enterprise Linux AI (RHEL AI) 3","affected":["enterprise_linux_ai_rhel_ai 3","streams_for_apache_kafka 2","streams_for_apache_kafka 3.2.1"],"patched":["streams_for_apache_kafka 3.2.1"],"published":"2026-07-27","updated":"2026-10-06","sourceUpdated":"2026-10-06T19:30:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64648.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64648.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64648"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507642"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64648"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64648"},{"url":"https://github.com/vercel/next.js/commit/062f66700b52a5d6bba2c0605d55577ab7ad262c"},{"url":"https://github.com/vercel/next.js/commit/73b94872bc343d09494b50394d8c08eb9fc8e56a"},{"url":"https://github.com/vercel/next.js/releases/tag/v15.5.21"},{"url":"https://github.com/vercel/next.js/releases/tag/v16.2.11"},{"url":"https://github.com/vercel/next.js/security/advisories/GHSA-68g3-v927-f742"},{"url":"https://access.redhat.com/errata/RHSA-2026:54435"},{"url":"https://github.com/advisories/GHSA-68g3-v927-f742"}],"tags":["csaf","vex","red-hat","ghsa","npm"],"epss":0.00338,"epssPercentile":0.27055,"aliases":["GHSA-68g3-v927-f742"],"ecosystem":"npm","ingestedAt":"2026-07-23T00:08:38.922Z","slug":"CVE-2026-64648","body":"## Overview\n\nA flaw was found in Next.js. A remote attacker could exploit a vulnerability in the server-side fetch mechanism, where a request with a body might receive a cached response intended for a different request to the same URL but different body. This could lead to the unauthorized disclosure of confidential data from POST request response bodies to an unprivileged user.\n\n## Vendor advisories\n\n- **RHSA-2026:54435** · Red Hat · fixed in: Streams for Apache Kafka 3.2.1 · released 2026-08-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:54435)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux AI (RHEL AI) 3, streams for Apache Kafka 2 · no fix planned: Red Hat Enterprise Linux AI (RHEL AI) 3, streams for Apache Kafka 2 · updated 2026-10-06 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64648.json)\n\n**next: Next.js: Information disclosure via server-side fetch cache** — rated Important by Red Hat. Released 2026-07-27, updated 2026-10-06.\n\nAffected:\n\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- streams for Apache Kafka 2\n\nFixed:\n\n- Streams for Apache Kafka 3.2.1\n\nNo fix planned:\n\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- streams for Apache Kafka 2\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat Trusted Artifact Signer\n\n## Remediation\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:54435\n\n## Package advisory (CVE-2026-64648)\n\nAffected packages:\n\n- `next >= 13.0.0, < 15.5.21`\n- `next >= 16.0.0, < 16.2.11`\n\nPatched in:\n\n- `next 15.5.21`\n- `next 16.2.11`\n\nSource: https://github.com/advisories/GHSA-68g3-v927-f742","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":217227,"id":"CVE-2026-64648","ts":1791360786113,"field":"cvss","old":null,"new":"7.5"},{"seq":217226,"id":"CVE-2026-64648","ts":1791360786113,"field":"severity","old":"medium","new":"high"}]}