CVE-2026-44575: Next.js is a React framework for building full-stack web applications

Q: How do I fix CVE-2026-44575?

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

Q: Is CVE-2026-44575 being exploited?

CVE-2026-44575 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-2026-44575 affect?

CVE-2026-44575 affects next.js. Severity is high (CVSS 7.5). Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through t

Q: How urgent is CVE-2026-44575?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-44575 is a high-severity flaw (CVSS 7.5) 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 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended mid

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-288, CWE-551
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: >= 15.2.0 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 15.2.0

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 15.2.0

npm view next.js versions npm install next.js@"<15.2.0"

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-2026-44575?

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

Is CVE-2026-44575 being exploited?

CVE-2026-44575 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-2026-44575 affect?

CVE-2026-44575 affects next.js. Severity is high (CVSS 7.5). Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through t

How urgent is CVE-2026-44575?

Priority 50/100. High severity; 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-2026-44573 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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