HTTP Request Smuggling Affecting next package, versions >=9.5.0 <15.5.13>=16.0.0-beta.0 <16.1.7>=16.2.0-canary.0 <16.2.0-canary.102
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Test your applications- Snyk IDSNYK-JS-NEXT-15674558
- published17 Mar 2026
- disclosed17 Mar 2026
- creditUnknown
Introduced: 17 Mar 2026
NewCVE-2026-29057 (opens in a new tab)How to fix?
Upgrade next to version 15.5.13, 16.1.7, 16.2.0-canary.102 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to HTTP Request Smuggling during the rewrite of the proxy traffic to an external backend. An attacker can access unintended backend routes by sending crafted DELETE or OPTIONS requests with Transfer-Encoding: chunked headers. This is only exploitable if the application is not hosted on providers that handle rewrites at the CDN level.
Workaround
This vulnerability can be mitigated by blocking chunked DELETE/OPTIONS requests on rewritten routes at the edge/proxy, or by enforcing authentication and authorization on backend routes.