{"id":"CVE-2026-45109","aliases":["GHSA-26hh-7cqf-hhc6"],"url":"https://o3.security/vulnerability/CVE-2026-45109","summary":"Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes","details":"Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.","published":"2026-05-13T17:11:07.275Z","modified":"2026-07-18T03:41:42.255815657Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00556,"percentile":0.43315,"asOf":"2026-08-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"next","fixedVersion":"15.5.18"},{"ecosystem":"npm","name":"next","fixedVersion":"16.2.6"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.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/security/cve/CVE-2026-45109"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45109.json"},{"type":"ADVISORY","url":"https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45109"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477190"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-18T03:41:42.255815657Z"}}