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@dependabot dependabot bot commented on behalf of github Jan 28, 2026

Bumps next from 15.5.9 to 16.1.5.

Release notes

Sourced from next's releases.

v16.1.5

Please refer the following changelogs for more information about this security release:

https://vercel.com/changelog/summaries-of-cve-2025-59471-and-cve-2025-59472 https://vercel.com/changelog/summary-of-cve-2026-23864

v16.1.4

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

Core Changes

  • Only filter next config if experimental flag is enabled (#88733)

Credits

Huge thanks to @​mischnic for helping!

v16.1.3

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

Core Changes

  • Fix linked list bug in LRU deleteFromLru (#88652)
  • Fix relative same host redirects in node middleware (#88253)

Credits

Huge thanks to @​acdlite and @​ijjk for helping!

v16.1.2

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

Core Changes

  • Turbopack: Update to swc_core v50.2.3 (#87841) (#88296)
    • Fixes a crash when processing mdx files with multibyte characters. (#87713)
  • Turbopack: mimalloc upgrade and enabling it on musl (#88503) (#87815) (#88426)
    • Fixes a significant performance issue on musl-based Linux distributions (e.g. Alpine in Docker) related to musl's allocator.
    • Other platforms have always used mimalloc, but we previously did not use mimalloc on musl because of compilation issues that have since been resolved.

Credits

Huge thanks to @​mischnic for helping!

v16.1.1

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

... (truncated)

Commits
  • acba4a6 v16.1.5
  • e1d1fc6 Add maximum size limit for postponed body parsing (#88175)
  • 500ec83 fetch(next/image): reduce maximumResponseBody from 300MB to 50MB (#88588)
  • 1caaca3 feat(next/image)!: add images.maximumResponseBody config (#88183)
  • 522ed84 Sync DoS mitigations for React Flight
  • 8cad197 [backport][cna] Ensure created app is not considered the workspace root in pn...
  • 2718661 Backport/docs fixes (#89031)
  • 5333625 Backport/docs fixes 16.1.5 (#88916)
  • 60de6c2 v16.1.4
  • 5f75d22 backport: Only filter next config if experimental flag is enabled (#88733) (#...
  • Additional commits viewable in compare view

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Bumps [next](https://github.com/vercel/next.js) from 15.5.9 to 16.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.9...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
@dependabot dependabot bot added dependencies Pull requests that update a dependency file javascript Pull requests that update javascript code labels Jan 28, 2026
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vercel bot commented Jan 28, 2026

The latest updates on your projects. Learn more about Vercel for GitHub.

Project Deployment Review Updated (UTC)
umami Ready Ready Preview, Comment Jan 28, 2026 6:36pm
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@greptile-apps
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greptile-apps bot commented Jan 28, 2026

Greptile Overview

Greptile Summary

This PR upgrades Next.js from version 15.5.9 to 16.1.5, a major version bump that includes critical security fixes and performance improvements.

Key Changes:

  • Security Fixes: Includes patches for CVE-2025-59471, CVE-2025-59472, and CVE-2026-23864 addressing DoS vulnerabilities in React Flight and next/image
  • Performance Improvements: Turbopack updates with mimalloc improvements for better performance on musl-based Linux distributions (Alpine Docker)
  • Bug Fixes: LRU cache linked list bug fixes and node middleware redirect fixes

Compatibility Assessment:

  • The project uses App Router (not Pages Router) which is well-supported in Next.js 16
  • React 19.2.3 is already in use, compatible with Next.js 16
  • Uses --turbo flag for builds, which is stable in Next.js 16
  • No experimental features detected in next.config.ts
  • Configuration uses standard Next.js features (headers, rewrites, redirects, basePath, standalone output)

Potential Concerns:

  • Major version upgrade: Next.js 16 may introduce breaking changes in APIs or behavior
  • Testing recommended: Comprehensive testing of App Router pages, API routes, and build process is essential
  • Image optimization: New images.maximumResponseBody config was introduced, defaulting to 50MB (reduced from 300MB)

Confidence Score: 4/5

  • This PR is relatively safe to merge after thorough testing, as it's a Dependabot security update upgrading to a stable Next.js version
  • Score of 4 reflects that this is a major version upgrade (15→16) which inherently carries some risk, but the security fixes are critical. The project configuration is straightforward without experimental features, and React 19 compatibility is already established. Comprehensive testing is needed before merging to production.
  • No files require special attention - this is a dependency version bump only

Important Files Changed

Filename Overview
package.json Upgraded Next.js from 15.5.9 to 16.1.5 (major version bump with security fixes)
pnpm-lock.yaml Lockfile updated with Next.js 16.1.5 and transitive dependencies including Sharp image library updates

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Dep as Dependabot
    participant CI as CI/CD Pipeline
    participant App as Umami App
    participant Next as Next.js Runtime
    
    Dep->>Dep: Detect Next.js security update
    Dep->>Dev: Create PR #3990 (15.5.9→16.1.5)
    Note over Dep,Dev: Includes CVE fixes for DoS vulnerabilities
    
    Dev->>CI: Trigger build & tests
    CI->>CI: Install dependencies (pnpm)
    CI->>CI: Run build-app (next build --turbo)
    CI->>Next: Initialize Next.js 16.1.5 with Turbopack
    Next->>Next: Apply security patches (CVE fixes)
    Next->>Next: Apply image optimization limits (50MB)
    Next->>CI: Build complete
    
    CI->>CI: Run test suite
    CI->>Dev: Report build & test results
    
    alt Tests Pass
        Dev->>Dev: Review changes & test locally
        Dev->>App: Merge & deploy
        App->>Next: Runtime with security fixes active
        Note over App,Next: Protected against DoS vulnerabilities
    else Tests Fail
        Dev->>Dev: Investigate breaking changes
        Dev->>Dev: Fix compatibility issues
    end
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