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GHSA-26hh-7cqf-hhc6

Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up

Source: GitHub Advisory Database (reviewed) High CVE-2026-45109

Packages

EcosystemPackageAffectedFixed in
npm next >= 15.2.0, < 15.5.18 15.5.18
npm next >= 16.0.0, < 16.2.6 16.2.6

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact It was found that the fix addressing [CVE-2026-44575](https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f) did not apply to `middleware.ts` with Turbopack. Refer to [CVE-2026-44575](https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f) for further details. ### References - [CVE CVE-2026-44575](https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f)

References

External links from the advisory. They lead to third-party sites.