There is a possible denial of service vulnerability in the content type
parsing component of Rack. This vulnerability has been assigned the CVE
identifier CVE-2024-25126.

Versions Affected: >= 0.4 Not affected: < 0.4 Fixed Versions: 3.0.9.1, 2.2.8.1

Impact

Carefully crafted content type headers can cause Rack’s media type parser to
take much longer than expected, leading to a possible denial of service
vulnerability.

Impacted code will use Rack’s media type parser to parse content type headers.
This code will look like below:

request.media_type

## OR
request.media_type_params

## OR
Rack::MediaType.type(content_type)

Some frameworks (including Rails) call this code internally, so upgrading is
recommended!

All users running an affected release should either upgrade or use one of the
workarounds immediately.

Releases

The fixed releases are available at the normal locations.

Workarounds

There are no feasible workarounds for this issue.