Bump next from 15.4.6 to 15.5.18

[dependabot]

Bumps next from 15.4.6 to 15.5.18.

Release notes

Sourced from next's releases.

v15.5.18

This release contains security fixes for the following advisories:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-26hh-7cqf-hhc6: Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

v15.5.16

This release contains security fixes for the following advisories:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

v15.5.15

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

https://vercel.com/changelog/summary-of-cve-2026-23869

v15.5.14

[!NOTE]

... (truncated)

Commits

• 9ff92ce v15.5.18
• 00ebe23 [backport] Disable build caches for production/staging/force-preview deploys ...
• 62c97ab v15.5.17
• 423623a Turbopack: Match proxy matchers with webpack implementation (#93594)
• fa78739 Turbopack: Fix middleware matcher suffix (#93590)
• 36e62c6 [backport] Turbopack: more strict vergen setup (#93588)
• 36589b5 [backport][test] Pin package manager to patch versions (#93596)
• ad6fd4e v15.5.16
• 79d7dff Ignore malformed CSP nonce headers (#103)
• c4f6908 router-server: guard upgrade proxy against absolute-url SSRF (#77) (#102)
• Additional commits viewable in compare view

Maintainer changes

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[github-actions]

@dependabot merge

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 duplication

Metric	Results
Duplication	0

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AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}

[codacy-production]

Pull Request Overview

This PR upgrades Next.js to version 15.5.18 to mitigate several security vulnerabilities, including DoS, SSRF, and XSS. Although Codacy indicates the changes are up to standards, a critical peer dependency conflict has been identified that prevents successful installation: Next.js 15 requires React 19, but the project is currently configured with React 18.3.1. This blocker must be resolved by also upgrading the React dependencies to ensure the application remains functional.

Test suggestions

• Verify that the application builds successfully without errors using Next.js 15.5.18.
• Verify that the application's core functionality, such as routing and server-side rendering, remains intact after the upgrade.

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Verify that the application builds successfully without errors using Next.js 15.5.18.
2. Verify that the application's core functionality, such as routing and server-side rendering, remains intact after the upgrade.

_{TIP Improve review quality by adding custom instructions
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[codacy-production]

_{🔴 HIGH RISK}

Next.js 15 requires React 19 and React DOM 19 as peer dependencies. The package.json currently specifies React 18.3.1, which will lead to installation failures. Try running the following prompt in your coding agent: > Upgrade react and react-dom to version 19.