{"id":"CVE-2026-44579","aliases":["GHSA-mg66-mrh9-m8jx"],"url":"https://o3.security/vulnerability/CVE-2026-44579","summary":"Next.js: Denial of Service via connection exhaustion in applications using Cache Components","details":"### Impact\n\nApplications using Partial Prerendering through the Cache Components feature can be vulnerable to connection exhaustion through crafted POST requests to a server action. In affected configurations, a malicious request can trigger a request-body handling deadlock that leaves connections open for an extended period, consuming file descriptors and server capacity until legitimate users are denied service.\n\n### Fix\n\nWe now treat the header used for resuming Partial Prerendered requests as an internal-only header and strip it from untrusted incoming requests. This header should never be accepted directly from external clients.\n\n### Workarounds\n\nIf you cannot upgrade immediately, block requests that would be handled by Next.js if they contain the `Next-Resume` header at the edge.","published":"2026-05-13T17:04:28.388Z","modified":"2026-08-15T04:07:17.491856081Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00746,"percentile":0.52459,"asOf":"2026-09-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"next","fixedVersion":"15.5.16"},{"ecosystem":"npm","name":"next","fixedVersion":"16.2.5"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44579.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37272"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40974"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:54435"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-44579"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44579.json"},{"type":"ADVISORY","url":"https://github.com/vercel/next.js/security/advisories/GHSA-mg66-mrh9-m8jx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44579"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477193"},{"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T04:07:17.491856081Z"}}