CVE-2026-103004: Next.js versions from 16.3.0 to 16.3.7 warm `use cache` handlers using `next/root-params` and can leak their r

Q: How do I fix CVE-2026-103004?

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

Q: Is CVE-2026-103004 being exploited?

CVE-2026-103004 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-2026-103004 affect?

CVE-2026-103004 affects next.js. Severity is medium (CVSS 5.3). Next.js versions from 16.3.0 to 16.3.7 warm `use cache` handlers using `next/root-params` and can leak their return value to pages with different root params. With Cache Components enabled (cacheComponents: true), a 'use cache' function tha

Q: How urgent is CVE-2026-103004?

Priority 28/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-103004 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 versions from 16.3.0 to 16.3.7 warm `use cache` handlers using `next/root-params` and can leak their return value to pages with different root params. With Cache Components enabled (cacheComponents: true), a 'use cache' function that calls another 'use cache' function that reads a root param can be keyed incorrectly when the inner call is served from an existing entry: the enclosing function's cache key then omits that root param. The enc

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	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-524
Published	2026-10-01
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

2026-10-01 15:17 UTCPublished CVE record published
2026-10-05 15:01 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 16.3.0 and < 16.3.8

Fixed in: 16.3.8

Safe to downgrade to: a release before 16.3.0

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 16.3.0

npm view next.js versions npm install next.js@"<16.3.0"

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-2026-103004?

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

Is CVE-2026-103004 being exploited?

CVE-2026-103004 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-2026-103004 affect?

CVE-2026-103004 affects next.js. Severity is medium (CVSS 5.3). Next.js versions from 16.3.0 to 16.3.7 warm `use cache` handlers using `next/root-params` and can leak their return value to pages with different root params. With Cache Components enabled (cacheComponents: true), a 'use cache' function tha

How urgent is CVE-2026-103004?

Priority 28/100. Remotely exploitable, no login, no user action

Software pages

Next.js vulnerabilities

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References

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