Security

• breaking: Added default limit to how much data Bytes::from_request will consume. Previously it would attempt to consume the entire request body without checking its length. This meant if a malicious peer sent an large (or infinite) request body your server might run out of memory and crash.

  The default limit is at 2 MB and can be disabled by adding the new DefaultBodyLimit::disable() middleware. See its documentation for more details.

  This also applies to these extractors which used Bytes::from_request internally:

  • Form
  • Json
  • String

  Thanks to Shachar Menashe for reporting this vulnerability.

  (#1346)

Routing

• breaking: Adding a .route_layer onto a Router or MethodRouter without any routes will now result in a panic. Previously, this just did nothing. #1327

Middleware

• added: Add middleware::from_fn_with_state and middleware::from_fn_with_state_arc to enable running extractors that require state (#1342)