high7.5
CVE-2026-45109
Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | next | >= 15.2.0, < 15.5.18 | 15.5.18 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vercel | Next.Js | from 15.2.0 before 15.5.18 from 16.0.0 before 16.2.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/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://github.com/vercel/next.js/releases/tag/v15.5.18
- https://github.com/vercel/next.js/releases/tag/v16.2.6
- https://nvd.nist.gov/vuln/detail/CVE-2026-45109
- https://access.redhat.com/errata/RHSA-2026:34608
- https://access.redhat.com/errata/RHSA-2026:37272
- https://access.redhat.com/errata/RHSA-2026:40974
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/security/cve/CVE-2026-45109
- https://bugzilla.redhat.com/show_bug.cgi?id=2477190
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json