GHSA-8f24-v5vv-gm5j
next-intl has an open redirect vulnerability
Quick fix
GHSA-8f24-v5vv-gm5j — next-intl: upgrade to the fixed version with the command below.
npm install next-intl@4.9.1Details
### Impact
Applications using the `next-intl` middleware with `localePrefix: 'as-needed'` could construct URLs where path handling and the WHATWG URL parser resolved a relative redirect target to another host (e.g. scheme-relative `//` or control characters stripped by the URL parser), so the middleware could redirect the browser off-site while the user still started from a trusted app URL.
### Patches
The problem has been patched, please update to [`next-intl@4.9.1`](https://github.com/amannn/next-intl/releases/tag/v4.9.1).
### Credits
Many thanks to [Joni Liljeblad](https://github.com/joniumGit) from [Oura](https://ouraring.com) for responsibly disclosing the vulnerability and for suggesting the fix.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/amannn/next-intl/security/advisories/GHSA-8f24-v5vv-gm5j[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-40299[ADVISORY]
- https://github.com/amannn/next-intl/pull/2304[WEB]
- https://github.com/amannn/next-intl/commit/1c80b668aa6d853f470319eec10a3f61e78a70e6[WEB]
- https://github.com/amannn/next-intl[PACKAGE]
- https://github.com/amannn/next-intl/releases/tag/v4.9.1[WEB]