CVE-2026-44581: Next.js is a React framework for building full-stack web applications

Q: How do I fix CVE-2026-44581?

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

Q: Is CVE-2026-44581 being exploited?

CVE-2026-44581 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-2026-44581 affect?

CVE-2026-44581 affects next.js. Severity is medium (CVSS 4.7). Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared ca

Q: How urgent is CVE-2026-44581?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2026-44581 is a medium-severity flaw (CVSS 4.7) 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 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
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 18:16 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

vercel next.js UPGRADE

Affected: >= 13.4.0 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 13.4.0

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 13.4.0

npm view next.js versions npm install next.js@"<13.4.0"

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-2026-44581?

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

Is CVE-2026-44581 being exploited?

CVE-2026-44581 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-2026-44581 affect?

CVE-2026-44581 affects next.js. Severity is medium (CVSS 4.7). Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared ca

How urgent is CVE-2026-44581?

Priority 20/100. No elevated risk signals yet.

Software pages

React vulnerabilities · Next.js vulnerabilities

Related CVEs

CVE-2026-44578 HIGH 8.6 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44579 HIGH 7.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-45109 HIGH 7.5 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44580 MEDIUM 6.1 UPGRADE Next.js is a React framework for building full-stack web applications
CVE-2026-44582 LOW 3.7 UPGRADE Next.js is a React framework for building full-stack web applications

References

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