{"id":"CVE-2026-44574","summary":"Next.js: Middleware / Proxy bypass through dynamic route parameter injection","details":"Next.js is a React framework for building full-stack web applications. From 15.4.0 to before 15.5.16 and 16.2.5, applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially crafted query parameters can alter the dynamic route value seen by the page while leaving the visible path unchanged, which can allow protected content to be rendered without passing the expected middleware check. This vulnerability is fixed in 15.5.16 and 16.2.5.","aliases":["GHSA-492v-c6pp-mqqv"],"modified":"2026-08-15T04:07:22.360846297Z","published":"2026-05-13T16:56:06.008Z","related":["CGA-9j9f-g8g8-c4w5"],"database_specific":{"cwe_ids":["CWE-288"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44574.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44574.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-2026-44574"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44574.json"},{"type":"ADVISORY","url":"https://github.com/vercel/next.js/security/advisories/GHSA-492v-c6pp-mqqv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44574"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477207"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/vercel/next.js","events":[{"introduced":"7ad467409b67691ae4f5dc4dc47f1a247c4ba988"},{"fixed":"ad6fd4e50e5aba20b60d283c42b89273a3167ccd"},{"introduced":"950609f96f694c5475d18cd2d72a0052ca04d4b9"},{"fixed":"766148f9cd48c0e218acafcd0f15defc14871bf4"}],"database_specific":{"cpe":"cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"15.4.0"},{"fixed":"15.5.16"},{"introduced":"16.0.0"},{"fixed":"16.2.5"}],"source":"CPE_RANGE"}}],"versions":["v15.5.15","v16.2.4","v16.2.3","v16.2.2","v15.5.14","v16.2.1","v15.5.13","v16.2.0","v16.2.0-canary.104","v16.2.0-canary.103","v16.2.0-canary.102","v16.2.0-canary.101","v15.5.12","v16.2.0-canary.100","v16.2.0-canary.99","v16.2.0-canary.98","v16.2.0-canary.97","v16.2.0-canary.96","v16.2.0-canary.95","v16.2.0-canary.94","v16.2.0-canary.93","v16.2.0-canary.92","v16.2.0-canary.91","v16.2.0-canary.90","v16.2.0-canary.89","v16.2.0-canary.88","v16.2.0-canary.87","v16.2.0-canary.86","v16.2.0-canary.85","v16.2.0-canary.84","v16.2.0-canary.83","v16.2.0-canary.82","v16.2.0-canary.81","v16.2.0-canary.78","v16.2.0-canary.80","v16.2.0-canary.79","v16.2.0-canary.77","v16.2.0-canary.76","v16.2.0-canary.75","v16.2.0-canary.74","v16.2.0-canary.71","v16.2.0-canary.73","v16.2.0-canary.69","v16.2.0-canary.72","v16.2.0-canary.70","v16.2.0-canary.68","v16.2.0-canary.67","v16.2.0-canary.66","v16.2.0-canary.65","v16.2.0-canary.64","v16.2.0-canary.63","v16.2.0-canary.62","v16.2.0-canary.61","v16.2.0-canary.60","v16.2.0-canary.59","v16.2.0-canary.58","v16.2.0-canary.57","v16.2.0-canary.56","v16.2.0-canary.55","v16.2.0-canary.54","v16.2.0-canary.53","v16.2.0-canary.52","v16.2.0-canary.51","v16.2.0-canary.50","v16.2.0-canary.49","v16.2.0-canary.48","v16.2.0-canary.47","v16.2.0-canary.46","v16.2.0-canary.45","v16.2.0-canary.44","v16.2.0-canary.43","v16.2.0-canary.42","v16.2.0-canary.41","v16.2.0-canary.40","v16.2.0-canary.39","v16.2.0-canary.38","v16.2.0-canary.37","v16.2.0-canary.36","v16.2.0-canary.35","v16.2.0-canary.34","v16.2.0-canary.33","v16.2.0-canary.32","v16.2.0-canary.31","v16.2.0-canary.30","v16.2.0-canary.29","v16.2.0-canary.28","v16.2.0-canary.27","v16.2.0-canary.26","v16.2.0-canary.25","v16.2.0-canary.24","v16.2.0-canary.23","v16.2.0-canary.22","v16.2.0-canary.21","v16.2.0-canary.20","v16.2.0-canary.19","v16.2.0-canary.18","v16.2.0-canary.17","v16.2.0-canary.16","v16.2.0-canary.15","v15.5.11","v16.2.0-canary.14","v15.5.10","v16.2.0-canary.11","v16.2.0-canary.13","v16.2.0-canary.12","v16.2.0-canary.10","v16.2.0-canary.9","v15.5.9","v16.2.0-canary.8","v16.2.0-canary.7","v16.2.0-canary.6","v16.2.0-canary.5","v16.2.0-canary.4","v16.2.0-canary.3","v16.2.0-canary.2","v16.2.0-canary.1","v16.2.0-canary.0","v16.1.1-canary.36","v16.1.1-canary.35","v16.1.1-canary.34","v16.1.1-canary.33","v16.1.1-canary.32","v16.1.1-canary.30","v16.1.1-canary.31","v16.1.1-canary.29","v16.1.1-canary.28","v16.1.1-canary.27","v16.1.1-canary.26","v16.1.1-canary.25","v16.1.1-canary.24","v16.1.1-canary.23","v16.1.1-canary.22","v16.1.1-canary.21","v16.1.1-canary.20","v16.1.1-canary.19","v16.1.1-canary.18","v16.1.1-canary.17","v16.1.1-canary.16","v16.1.1-canary.15","v16.1.1-canary.14","v16.1.1-canary.13","v16.1.1-canary.12","v16.1.1-canary.11","v16.1.1-canary.10","v16.1.1-canary.9","v16.1.1-canary.8","v16.1.1-canary.7","v16.1.1-canary.6","v16.1.1-canary.5","v16.1.1-canary.4","v16.1.0","v16.1.1-canary.3","v16.1.1-canary.2","v16.1.1-canary.1","v16.1.1-canary.0","v16.1.0-canary.34","v16.1.0-canary.33","v16.1.0-canary.32","v16.1.0-canary.31","v16.1.0-canary.30","v16.1.0-canary.29","v16.1.0-canary.28","v16.1.0-canary.27","v16.1.0-canary.26","v16.1.0-canary.25","v16.1.0-canary.24","v16.1.0-canary.23","v16.1.0-canary.22","v16.1.0-canary.21","v16.1.0-cana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