🚨 Next.js Vulnerable to HTTP Request Smuggling

Impact

Inconsistent interpretation of a crafted HTTP request meant that requests are treated as both a single request, and two separate requests by Next.js, leading to desynchronized responses. This led to a response queue poisoning vulnerability in the affected Next.js versions.

For a request to be exploitable, the affected route also had to be making use of the rewrites feature in Next.js.

Patches

The vulnerability is resolved in Next.js 13.5.1 and newer. This includes Next.js 14.x.

Workarounds

There are no official workarounds for this vulnerability. We recommend that you upgrade to a safe version.

References

https://portswigger.net/web-security/request-smuggling/advanced/response-queue-poisoning

🚨 Next.js Server-Side Request Forgery in Server Actions

Impact

A Server-Side Request Forgery (SSRF) vulnerability was identified in Next.js Server Actions by security researchers at Assetnote. If the Host header is modified, and the below conditions are also met, an attacker may be able to make requests that appear to be originating from the Next.js application server itself.

Prerequisites

• Next.js (<14.1.1) is running in a self-hosted* manner.
• The Next.js application makes use of Server Actions.
• The Server Action performs a redirect to a relative path which starts with a /.

* Many hosting providers (including Vercel) route requests based on the Host header, so we do not believe that this vulnerability affects any Next.js applications where routing is done in this manner.

Patches

This vulnerability was patched in #62561 and fixed in Next.js 14.1.1.

Workarounds

There are no official workarounds for this vulnerability. We recommend upgrading to Next.js 14.1.1.

Credit

Vercel and the Next.js team thank Assetnote for responsibly disclosing this issue to us, and for working with us to verify the fix. Thanks to:

Adam Kues - Assetnote
Shubham Shah - Assetnote

🚨 Next.js missing cache-control header may lead to CDN caching empty reply

Next.js before 13.4.20-canary.13 lacks a cache-control header and thus empty prefetch responses may sometimes be cached by a CDN, causing a denial of service to all users requesting the same URL via that CDN. Cloudflare considers these requests cacheable assets.

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

See the full diff on Github. The new version differs by 10 commits:

• v14.2.3
• Clean-up fetch metrics tracking (#64746)
• fix: remove traceparent from cachekey should not remove traceparent from original object (#64727)
• fix root page revalidation when redirecting in a server action (#64730)
• prevent erroneous route interception during lazy fetch (#64692)
• fix(fetch-cache): fix additional typo, add type & data validation (#64799)
• Fix next/image usage in mdx (#64875)
• Fix mixed exports in server component with barrel optimization (#64894)
• fix: mixing namespace import and named import client components (#64809)
• Fix: resolve mixed re-exports module as cjs (#64681)

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