CVE-2026-64642: Next.js is a React framework for building full-stack web applications

This month

HIGH 8.2REMOTEUPGRADE

CVE-2026-64642 is a high-severity flaw (CVSS 8.2) affecting next.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-285
Published	2026-07-27
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: vercel

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-27 18:16 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 16.0.0 and < 16.2.11

Fixed in: 16.2.11

Safe to downgrade to: a release before 16.0.0

1. Check installed version

npm ls next.js

2. UPGRADE to 16.2.11

npm install next.js@">=16.2.11"

3. If no update is available yet, DOWNGRADE to a release before 16.0.0

npm view next.js versions npm install next.js@"<16.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

npm · next · FIXED · 16.2.11 · vulnerable: >= 16.0.0, < 16.2.11 · source

npm install next@">=16.2.11" npm ls next

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

RHEL 10 · firefox · NOT AFFECTED

RHEL 10 · thunderbird · NOT AFFECTED

RHEL 7 · firefox · NOT AFFECTED

RHEL 8 · firefox · NOT AFFECTED

RHEL 8 · thunderbird · NOT AFFECTED

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-64642?

next.js: upgrade to 16.2.11. Exact commands for each OS are on this page.

Is CVE-2026-64642 being exploited?

CVE-2026-64642 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-64642 affect?

CVE-2026-64642 affects next.js. Severity is high (CVSS 8.2). 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 b

How urgent is CVE-2026-64642?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Software pages

React vulnerabilities

Related CVEs

CVE-2026-64641 HIGH 7.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-64649 MEDIUM 6.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-64644 MEDIUM 5.3 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-64643 MEDIUM 5.3 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-64646 MEDIUM 5.3 UPGRADE Next.js is a React framework for building full-stack web applications

References

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