🚨 [security] Update next 14.2.25 → 14.2.35 (patch)

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ next (14.2.25 → 14.2.35) · Repo

Security Advisories 🚨

🚨 Next has a Denial of Service with Server Components - Incomplete Fix Follow-Up

It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and did not fully prevent denial-of-service attacks in all payload types. This affects React package versions 19.0.2, 19.1.3, and 19.2.2 and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-67779.

A malicious HTTP request can be crafted and sent to any Server Function endpoint that, when deserialized, can enter an infinite loop within the React Server Components runtime. This can cause the server process to hang and consume CPU, resulting in denial of service in unpatched environments.

🚨 Next Vulnerable to Denial of Service with Server Components

A vulnerability affects certain React packages for versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-55184.

A malicious HTTP request can be crafted and sent to any App Router endpoint that, when deserialized, can cause the server process to hang and consume CPU. This can result in denial of service in unpatched environments.

🚨 Next.js Improper Middleware Redirect Handling Leads to SSRF

A vulnerability in Next.js Middleware has been fixed in v14.2.32 and v15.4.7. The issue occurred when request headers were directly passed into NextResponse.next(). In self-hosted applications, this could allow Server-Side Request Forgery (SSRF) if certain sensitive headers from the incoming request were reflected back into the response.

All users implementing custom middleware logic in self-hosted environments are strongly encouraged to upgrade and verify correct usage of the next() function.

More details at Vercel Changelog

🚨 Next.js Content Injection Vulnerability for Image Optimization

A vulnerability in Next.js Image Optimization has been fixed in v15.4.5 and v14.2.31. The issue allowed attacker-controlled external image sources to trigger file downloads with arbitrary content and filenames under specific configurations. This behavior could be abused for phishing or malicious file delivery.

All users relying on images.domains or images.remotePatterns are encouraged to upgrade and verify that external image sources are strictly validated.

More details at Vercel Changelog

🚨 Information exposure in Next.js dev server due to lack of origin verification

Summary

A low-severity vulnerability in Next.js has been fixed in version 15.2.2. This issue may have allowed limited source code exposure when the dev server was running with the App Router enabled. The vulnerability only affects local development environments and requires the user to visit a malicious webpage while npm run dev is active.

Because the mitigation is potentially a breaking change for some development setups, to opt-in to the fix, you must configure allowedDevOrigins in your next config after upgrading to a patched version. Learn more.

Learn more: https://vercel.com/changelog/cve-2025-48068

Credit

Thanks to sapphi-red and Radman Siddiki for responsibly disclosing this issue.

🚨 Next.js may leak x-middleware-subrequest-id to external hosts

Summary

In the process of remediating CVE-2025-29927, we looked at other possible exploits of Middleware. We independently verified this low severity vulnerability in parallel with two reports from independent researchers.

Learn more here.

Credit

Thank you to Jinseo Kim kjsman and RyotaK (GMO Flatt Security Inc.) with takumi-san.ai for the responsible disclosure. These researchers were awarded as part of our bug bounty program.

Release Notes

14.2.35

Please see the Next.js Security Update for information about this security patch.

14.2.33

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• omit searchParam data from FlightRouterState before transport (#80734)

Credits

Huge thanks to @ztanner for helping!

14.2.32

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• fix router handling when setting a location response header #82588

Credits

Huge thanks to @ztanner for helping!

14.2.31

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• fix(next/image): improve and simplify detect-content-type (#82179)
• fix(next/image): fix image-optimizer.ts headers (#82178)

Credits

Huge thanks to @styfle and @ztanner for helping!

14.2.30

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• Backport config.allowedDevOrigins (#80410) (Learn More)

Credits

Huge thanks to @ijjk and @ztanner for helping!

14.2.28

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• fix: node.js module import error when using middleware (#77945)

Credits

Huge thanks to @ztanner for helping!

14.2.26

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• Match subrequest handling for edge and node (#77476)

Does any of this look wrong? Please let us know.

Sorry, we couldn't find anything useful about this release.

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