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CVE-2026-45109
Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
High7.5EPSS 0.85%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| redhat-SADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.85% · top 41% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References (12)
- https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f (opens in a new tab)x_refsource_MISC
- https://github.com/vercel/next.js/releases/tag/v15.5.18 (opens in a new tab)x_refsource_MISC
- https://github.com/vercel/next.js/releases/tag/v16.2.6 (opens in a new tab)x_refsource_MISC
- https://vercel.com/changelog/next-js-may-2026-security-release (opens in a new tab)x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-45109 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2477190 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json (opens in a new tab)x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:40974 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:37272 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34608 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54435 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-26hh-7cqf-hhc6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-45109)Record last updated .