CVE-2026-94486: Next.js is a React framework for building full-stack web applications

Q: How do I fix CVE-2026-94486?

next.js: upgrade to 16.3.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-94486 being exploited?

CVE-2026-94486 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-94486 affect?

CVE-2026-94486 affects next.js. Severity is medium (CVSS 5.4). Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website

Q: How urgent is CVE-2026-94486?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-94486 is a medium-severity flaw (CVSS 5.4) 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. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website visited by a developer can reach the endpoint and read the project's disk location, source code snippets from error reports, route inventory, and development logs. Production deployments do not serve this endp

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-10-02
Last modified	2026-10-05

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

Last updated 2026-10-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-02 16:16 UTCPublished CVE record published
2026-10-05 14:58 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 16.0.0 and < 16.3.8

Fixed in: 16.3.8

Safe to downgrade to: a release before 16.0.0

1. Check installed version

npm ls next.js

2. UPGRADE to 16.3.8

npm install next.js@">=16.3.8"

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.

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-2026-94486?

next.js: upgrade to 16.3.8. Exact commands for each OS are on this page.

Is CVE-2026-94486 being exploited?

CVE-2026-94486 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-2026-94486 affect?

CVE-2026-94486 affects next.js. Severity is medium (CVSS 5.4). Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website

How urgent is CVE-2026-94486?

Priority 19/100. No elevated risk signals yet.

Software pages

React vulnerabilities · Next.js vulnerabilities

Related CVEs

CVE-2026-44572 LOW 3.7 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44575 HIGH 7.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44573 HIGH 7.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44574 HIGH 8.1 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44577 MEDIUM 5.9 UPGRADE Next.js is a React framework for building full-stack web applications

References

← Back to latest CVEs