🚨 [security] Update next 15.4.3 → 15.4.11 (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 update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ next (15.4.3 → 15.4.11) · Repo

Security Advisories 🚨

🚨 Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components

A vulnerability affects certain React Server Components packages for versions 19.0.x, 19.1.x, and 19.2.x 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-2026-23864.

A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched environments.

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

It was discovered that the fix for CVE-2025-55184 in React Server Components was incomplete and did not fully mitigate denial-of-service conditions across all payload types. As a result, certain crafted inputs could still trigger excessive resource consumption.

This vulnerability affects React versions 19.0.2, 19.1.3, and 19.2.2, as well as frameworks that bundle or depend on these versions, including Next.js 13.x, 14.x, 15.x, and 16.x when using the App Router. The issue is tracked upstream as CVE-2025-67779.

A malicious actor can send a specially crafted HTTP request to a Server Function endpoint that, when deserialized, causes the React Server Components runtime to enter an infinite loop. This can lead to sustained CPU consumption and cause the affected server process to become unresponsive, resulting in a denial-of-service condition 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 Server Actions Source Code Exposure

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-2025-55183.

A malicious HTTP request can be crafted and sent to any App Router endpoint that can return the compiled source code of Server Functions. This could reveal business logic, but would not expose secrets unless they were hardcoded directly into Server Function code.

🚨 Next.js is vulnerable to RCE in React flight protocol

A vulnerability affects certain React packages¹ for versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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-2025-55182.

Fixed in:
React: 19.0.1, 19.1.2, 19.2.1
Next.js: 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7, 15.6.0-canary.58, 16.1.0-canary.12+

The vulnerability also affects experimental canary releases starting with 14.3.0-canary.77. Users on any of the 14.3 canary builds should either downgrade to a 14.x stable release or 14.3.0-canary.76.

All users of stable 15.x or 16.x Next.js versions should upgrade to a patched, stable version immediately.

¹ The affected React packages are:

• react-server-dom-parcel
• react-server-dom-turbopack
• react-server-dom-webpack

🚨 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

🚨 Next.js Affected by Cache Key Confusion for Image Optimization API Routes

A vulnerability in Next.js Image Optimization has been fixed in v15.4.5 and v14.2.31. When images returned from API routes vary based on request headers (such as Cookie or Authorization), these responses could be incorrectly cached and served to unauthorized users due to a cache key confusion bug.

All users are encouraged to upgrade if they use API routes to serve images that depend on request headers and have image optimization enabled.

More details at Vercel Changelog

🚨 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

Release Notes

15.4.11

Please see this changelog for more information about this security patch.

15.4.10

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

15.4.8

Please see CVE-2025-66478 for additional details about this release.

15.4.7

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!

15.4.6

Note

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

Core Changes

• fix: _error page's req.url can be overwritten to dynamic param on minimal mode (#82347)
• fix: add ?dpl to fonts in /_next/static/media (#82384)

Credits

Huge thanks to @devjiwonchoi, @ijjk, and @styfle for helping!

15.4.5

Note

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

Core Changes

• Fix API stripping JSON incorrectly (#82062)
• Fix i18n fallback: false collision (#82158)
• Revert "Fix tracing of server actions imported by client components (#82167)
• Ensure setAssetPrefix updates config instance (#82165)
• Turbopack: update mimalloc (#82166)
• fix(next/image): fix image-optimizer.ts headers (#82175)
• fix(next/image): improve and simplify detect-content-type (#82174)

Credits

Huge thanks to @ijjk, @sokra, and @styfle for helping!

15.4.4

Note

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

Core Changes

• Fix dynamicParams false layout case in dev (#82026)
• Turbopack: fix scope hoisting variable renaming bug (#81640)
• Upgrade to swc v33 (#81750)
• Revert "[metadata] use https protocol for schema urls" (#81934)

Credits

Huge thanks to @bgw @mischnic @huozhi @lukesandberg and @ijjk for helping!

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

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

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Project	Deployment	Review	Updated (UTC)
ts-nextjs-tailwind-starter	Ready	Preview, Comment	Jan 28, 2026 4:21pm