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Fencer Vulns
high 8.2

CVE-2026-64642 json

Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale

published 2026-07-21 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-49382 , GHSA-6gpp-xcg3-4w24

cvss
8.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.

Patch / fix

  • npm next 16.2.11
  • vercel next.js 16.2.11

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64642 updated cvss 8.2

next: Next.js: Authentication bypass leading to unauthorized access

  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9 Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: no fix available “Fix deferred”
  • Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 7 process-nextick-args 2.0.1 Red Hat Single Sign-On 7 process-nextick-args 2.0.1
    affected: no fix available “Fix deferred”
  • Red Hat Cryostat 4 i18next 25.10.10 Red Hat 3scale API Management Platform 2 3scale-amp2/system-rhel7, 3scale-amp2/backend-rhel8
    not affected: component not present
  • Red Hat AMQ Broker 7 i18next 25.10.10
    not affected: vulnerable code not present
  • Red Hat build of Apache Camel - HawtIO 4 quarkus-websockets-next-spi 3.33.2.redhat-00004 Red Hat build of Apache Camel 4 for Quarkus 3 quarkus-websockets-next-spi 3.33.2.redhat-00004 Red Hat build of Apache Camel for Spring Boot 4 i18next 25.10.10
    not affected: component not present
  • Red Hat build of Apicurio Registry 3 quarkus-websockets-next-spi 3.33.2.redhat-00004
    not affected: vulnerable code not present
  • Red Hat Build of Keycloak quarkus-websockets-next-spi 3.33.2.redhat-00004 Red Hat build of Quarkus quarkus-websockets-next-deployment 3.27.4.redhat-00009 Red Hat Data Grid 8 i18next 25.10.10
    not affected: component not present
show 5 more
  • Red Hat Enterprise Linux 7 firefox, firefox 140.13.0-1.el10_2
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 firefox, thunderbird, firefox 140.13.0-1.el10_2, thunderbird 140.12.0-1.el10_2 Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird, firefox 140.13.0-1.el10_2, thunderbird 140.12.0-1.el10_2 Red Hat Enterprise Linux 10 firefox 140.13.0-1.el10_2, thunderbird 140.12.0-1.el10_2
    not affected: component not present
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform 8 i18next 25.10.10
    not affected: component not present
  • Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9 Red Hat Trusted Artifact Signer rhtas/rekor-search-ui-rhel9 Red Hat streams for Apache Kafka 2 next 15.5.18 Red Hat streams for Apache Kafka 3 next 15.5.18
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm next
>=16.0.0, <16.2.11
16.2.11

Affected products

  • vercel next.js

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of vercel/next.js published their own advisory on GitHub. Reviewed sources take precedence over it.