CVE-2026-94543: Next.js is a React framework for building full-stack web applications

Q: How do I fix CVE-2026-94543?

next.js: upgrade to 15.5.27, 16.3.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-94543 being exploited?

CVE-2026-94543 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-2026-94543 affect?

CVE-2026-94543 affects next.js. Severity is medium (CVSS 5.3). Next.js is a React framework for building full-stack web applications. From 15.0.0 until 15.5.27 and 16.3.8, self-hosted applications using the Pages Router with statically generated or Incremental Static Regeneration pages can key a respon

Q: How urgent is CVE-2026-94543?

Priority 34/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-94543 is a medium-severity flaw (CVSS 5.3) 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 15.0.0 until 15.5.27 and 16.3.8, self-hosted applications using the Pages Router with statically generated or Incremental Static Regeneration pages can key a response cache entry without sufficiently binding it to the source route. A request can replace one page's cache entry with content from a different route, causing the affected page to serve incorrect content to ever

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-524
Published	2026-10-02
Last modified	2026-10-06

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

Last updated 2026-10-06 · 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
2026-10-06 17:17 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 15.0.0 and < 15.5.27 · >= 16.0.0 and < 16.3.8

Fixed in: 15.5.27, 16.3.8

Safe to downgrade to: a release before 15.0.0

1. Check installed version

npm ls next.js

2. UPGRADE to 15.5.27

npm install next.js@">=15.5.27"

3. If no update is available yet, DOWNGRADE to a release before 15.0.0

npm view next.js versions npm install next.js@"<15.0.0"

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-2026-94543?

next.js: upgrade to 15.5.27, 16.3.8. Exact commands for each OS are on this page.

Is CVE-2026-94543 being exploited?

CVE-2026-94543 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-2026-94543 affect?

CVE-2026-94543 affects next.js. Severity is medium (CVSS 5.3). Next.js is a React framework for building full-stack web applications. From 15.0.0 until 15.5.27 and 16.3.8, self-hosted applications using the Pages Router with statically generated or Incremental Static Regeneration pages can key a respon

How urgent is CVE-2026-94543?

Priority 34/100. Remotely exploitable, no login, no user action

Software pages

React vulnerabilities · Next.js vulnerabilities

Related CVEs

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
CVE-2026-44576 MEDIUM 5.4 UPGRADE Next.js is a React framework for building full-stack web applications

References

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