{"action":"Upgrade next to 15.5.18 or later.","affected":[{"fixed":"15.5.18","introduced":"15.2.0"},{"fixed":"16.2.6","introduced":"16.0.0"}],"component":"next","cve_ids":["CVE-2026-45109"],"ecosystem":"npm","epss":0.00602,"exploited":false,"fixed_versions":["15.5.18","16.2.6"],"ghsa_id":"GHSA-26hh-7cqf-hhc6","id":"tcs_01M5KES4H7CJJYR62EERCFQ7YH","modified_at":"2026-09-10T03:50:45.324330779Z","published_at":"2026-05-11T16:21:19Z","references":["https://osv.dev/vulnerability/GHSA-26hh-7cqf-hhc6","https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f","https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6","https://nvd.nist.gov/vuln/detail/CVE-2026-45109","https://github.com/vercel/next.js","https://github.com/vercel/next.js/releases/tag/v15.5.18","https://github.com/vercel/next.js/releases/tag/v16.2.6"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-26hh-7cqf-hhc6","url":"https://osv.dev/vulnerability/GHSA-26hh-7cqf-hhc6"}],"summary":"Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up"}