Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.6%
exploitation probability
0.6%top 54% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
vercel · next.jsReferences
https://access.redhat.com/errata/RHSA-2026:34608https://access.redhat.com/errata/RHSA-2026:37272https://access.redhat.com/errata/RHSA-2026:40974https://access.redhat.com/errata/RHSA-2026:54435https://access.redhat.com/security/cve/CVE-2026-45109https://bugzilla.redhat.com/show_bug.cgi?id=2477190https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json