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

Q: How do I fix CVE-2026-44576?

next.js: upgrade to 15.5.16, 16.2.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-44576 being exploited?

CVE-2026-44576 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-2026-44576 affect?

CVE-2026-44576 affects next.js. Severity is medium (CVSS 5.4). Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition r

Q: How urgent is CVE-2026-44576?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.4REMOTEUPGRADE

CVE-2026-44576 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 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-436
Published	2026-05-13
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 17:16 UTCPublished CVE record published
2026-10-26 17:10 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 14.2.0 and < 15.5.16 · >= 16.0.0 and < 16.2.5

Fixed in: 15.5.16, 16.2.5

Safe to downgrade to: a release before 14.2.0

1. Check installed version

npm ls next.js

2. UPGRADE to 15.5.16

npm install next.js@">=15.5.16"

3. If no update is available yet, DOWNGRADE to a release before 14.2.0

npm view next.js versions npm install next.js@"<14.2.0"

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-2026-44576?

next.js: upgrade to 15.5.16, 16.2.5. Exact commands for each OS are on this page.

Is CVE-2026-44576 being exploited?

CVE-2026-44576 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-2026-44576 affect?

CVE-2026-44576 affects next.js. Severity is medium (CVSS 5.4). Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition r

How urgent is CVE-2026-44576?

Priority 29/100. Remotely exploitable, no login, no user action

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

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