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CVE-2026-44575

Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

Published: May 13, 2026Updated: Jun 30, 2026 Sources: CVE List NVDCWE-288
7.5HIGH
NVD MITRE
EPSS Score
1.4%
Top 30.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-288CWE-551

Affected Products

vercel
commercial·US
next.jsLibraryLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available
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References

https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f
github.com
https://access.redhat.com/security/cve/CVE-2026-44575
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2477188
bugzilla.redhat.com
and 1 more references View all →
News mentions
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