CVE-2026-44575Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
Updated under an hour ago ()
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It affects vercel next.js and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-288, CWE-551
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Modified
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vercel next.js vercel:next.js (from the name) | from 16.0.0, < 16.2.5; from 15.2.0, < 15.5.16 | CNA record |
Red Hat Streams for Apache Kafka 2.9.4 redhat:amq_streams | 2.9 | CISA ADP |
Red Hat Red Hat Trusted Artifact Signer 1.3 redhat:trusted_artifact_signer | from 1783958622 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CISA ADP |
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 redhat:enterprise_linux_ai | 3 | CISA ADP |
vercel next.js vercel:next.js | from 15.2.0 before 15.5.16; from 16.0.0 before 16.2.5 | NVD |
References
- https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53fx-refsource-confirm, vendor-advisory
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.