🚨 [security] Update all of nextjs 15.0.0-canary.160 → 15.3.2 (minor)

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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/bundle-analyzer (14.2.13 → 15.3.2)

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

✳️ next (15.0.0-canary.160 → 15.3.2) · Repo

Security Advisories 🚨

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

Summary

This vulnerability is similar to CVE-2018-14732. When running a Next.js server locally (e.g. through npm run dev), the WebSocket server is vulnerable to the Cross-site WebSocket hijacking (CSWSH) attack. and a bad actor can access the source code of client components, if a user was to visit a malicious link while having the Next.js dev server running.

Impact

If a user is running a Next.js server locally (e.g. npm run dev), and they were to browse to a malicious website, the malicious website may be able to access the source code of the Next.js app. This vulnerability only affects applications making use of App Router.

Note: App Router was experimental requiring experimental.appDir = true in versions >=13.0.0 to <13.4.

🚨 Next.js Race Condition to Cache Poisoning

Summary
We received a responsible disclosure from Allam Rachid (zhero) for a low-severity race-condition vulnerability in Next.js. This issue only affects the Pages Router under certain misconfigurations, causing normal endpoints to serve pageProps data instead of standard HTML.

Learn more here

Credit
Thank you to Allam Rachid (zhero) for the responsible disclosure. This research was rewarded as part of our bug bounty program.

🚨 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.

🚨 Authorization Bypass in Next.js Middleware

Impact

It is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware.

Patches

• For Next.js 15.x, this issue is fixed in 15.2.3
• For Next.js 14.x, this issue is fixed in 14.2.25
• For Next.js 13.x, this issue is fixed in 13.5.9
• For Next.js 12.x, this issue is fixed in 12.3.5
• For Next.js 11.x, consult the below workaround.

Note: Next.js deployments hosted on Vercel are automatically protected against this vulnerability.

Workaround

If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application.

Credits

• Allam Rachid (zhero;)
• Allam Yasser (inzo_)

🚨 Next.js Allows a Denial of Service (DoS) with Server Actions

Impact

A Denial of Service (DoS) attack allows attackers to construct requests that leaves requests to Server Actions hanging until the hosting provider cancels the function execution.

Note: Next.js server is idle during that time and only keeps the connection open. CPU and memory footprint are low during that time.

Deployments without any protection against long running Server Action invocations are especially vulnerable. Hosting providers like Vercel or Netlify set a default maximum duration on function execution to reduce the risk of excessive billing.

This is the same issue as if the incoming HTTP request has an invalid Content-Length header or never closes. If the host has no other mitigations to those then this vulnerability is novel.

This vulnerability affects only Next.js deployments using Server Actions.

Patches

This vulnerability was resolved in Next.js 14.2.21, 15.1.2, and 13.5.8. We recommend that users upgrade to a safe version.

Workarounds

There are no official workarounds for this vulnerability.

Credits

Thanks to the PackDraw team for responsibly disclosing this vulnerability.

Release Notes

Too many releases to show here. View the full release notes.

Commits

See the full diff on Github. The new version differs by 7 commits:

• v15.3.2
• backport: fix(turbopack): Store persistence of wrapped task on RawVc::LocalOutput (#78488) (#78883)
• @next/mdx: Use stable turbopack config options (#78880)
• fix(react-compiler): Fix detection of interest (#78879)
• fix(turbopack): Backport sourcemap bugfix (#78881)
• [next-server] preserve rsc query for rsc redirects (#78876)
• Update middleware public/static matching (#78875)

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Closed in favor of #137.