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High severity · published May 13, 2026
CVE-2026-45109
Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
next.js · vercel
>= 15.2.0, < 15.5.17; >= 16.0.0, < 16.2.6 · source: vendor, NVD
RH
Red Hat Enterprise Linux AI (RHEL AI) 3 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Trusted Artifact Signer 1.3 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Trusted Artifact Signer 1.4 · Red Hat
All versions, or not specified · source: CISA
SF
streams for Apache Kafka 3 · Red Hat
All versions, or not specified · source: CISA
Affected product
NE
next.js
vercel
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45109
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45109
Vendor Advisory
https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:34608
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:37272
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:40974
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:54435
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-45109
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