CVE-2026-44575 Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
HighCVSS 7.5
EPSS 1.6%
- Published
- Updated
- Exploit status
- No public exploit known
Description
Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | = >= 16.0.0, < 16.2.5 | No fix listed |
| vercel next.js | = >= 15.2.0, < 15.5.16 | No fix listed |
| redhat amq streams | = 2.9 | No fix listed |
| redhat trusted artifact signer | < 1783958622 | 1783958622 |
| redhat trusted artifact signer | < 1783327185 | 1783327185 |
| redhat enterprise linux | = 10 | No fix listed |
| redhat enterprise linux | = 7 | No fix listed |
| redhat enterprise linux | = 8 | No fix listed |
| redhat enterprise linux | = 9 | No fix listed |
| redhat enterprise linux ai | All versions | No fix listed |
| redhat amq streams | All versions | No fix listed |
| npm next(npm) | >= 15.2.0, < 15.5.16 | 15.5.16 |
| npm next(npm) | >= 16.0.0, < 16.2.5 | 16.2.5 |
| redhat/next(Red Hat:amq_streams:2.9::el9) | All versions | No fix listed |
| redhat/next(Red Hat:amq_streams:3.2::el9) | All versions | No fix listed |
| redhat/rhtas/rekor-search-ui-rhel9:1783958622(Red Hat:trusted_artifact_signer:1.3::el9) | All versions | No fix listed |
| redhat/rhtas/rekor-search-ui-rhel9:1783327185(Red Hat:trusted_artifact_signer:1.4::el9) | All versions | No fix listed |
| redhat/rhelai3/bootc-cuda-rhel9(Red Hat:enterprise_linux_ai:3) | All versions | No fix listed |
| redhat/rhelai3/bootc-gaudi-rhel9(Red Hat:enterprise_linux_ai:3) | All versions | No fix listed |
| redhat/rhelai3/bootc-rocm-rhel9(Red Hat:enterprise_linux_ai:3) | All versions | No fix listed |
| redhat/rhelai3/disk-image-cuda-rhel9(Red Hat:enterprise_linux_ai:3) | All versions | No fix listed |
| vercel next.js | >= 15.2.0, < 15.5.16 | 15.5.16 |
| vercel next.js | >= 16.0.0, < 16.2.5 | 16.2.5 |
References
- https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f vendor-advisory
- Red Hat CVE page mitigation vdb-entry vendor-advisory
- RHBZ#2477188 issue-tracking
- security.access.redhat.com
- RHSA-2026:40974 patch vendor-advisory
- RHSA-2026:37272 patch vendor-advisory
- RHSA-2026:34608 patch vendor-advisory
- RHSA-2026:54435 patch vendor-advisory
- github.com
- github.com
- nvd.nist.gov third-party-advisory
- github.com
- www.cve.org