Next.js is a React framework for building full-stack web applications.
CVE-2026-44575
Impact 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. Fix We now include App Router transport variants when generating middleware matchers, so middleware protections are applied consistently to those requests as well as to the normal page URL. Workarounds If you cannot upgrade immediately, enforce authorization in the underlying route or page logic instead of relying solely on middleware.
Assessment
- CVSS
- 7.5 (v3.1)
- Severity
- High
- EPSS
- 1.59% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 11 May 2026
- Last updated
- 26 October 2026
- Weakness
- CWE-288, CWE-551
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
At the source
References
- https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f
- 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-2026-44575
- https://bugzilla.redhat.com/show_bug.cgi?id=2477188
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44575.json
- https://github.com/vercel/next.js/releases/tag/v15.5.16
- https://github.com/vercel/next.js/releases/tag/v16.2.5
- https://nvd.nist.gov/vuln/detail/CVE-2026-44575
- https://github.com/advisories/GHSA-267c-6grr-h53f
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