Dnspython is vulnerable to a denial of service, caused by a flaw in stub resolver when a bad-in-some-way response arrives before a legitimate one on the UDP port dnspython is using for that query. By sending a specially crafted query, a remote attacker could exploit this vulnerability to cause a denial of service condition.

Impact The Eventlet WSGI parser is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer sections.

This vulnerability could enable attackers to: - Bypass front-end security controls - Launch targeted attacks against active site users - Poison web caches

Patches Problem has been patched in eventlet 0.40.3.

The patch just drops trailers. If a backend behind eventlet.wsgi proxy requires trailers, then this patch BREAKS your setup.

Workarounds Do not use eventlet.wsgi facing untrusted clients.

References - Patch https://github.com/eventlet/eventlet/pull/1062 - This issue is similar to https://github.com/advisories/GHSA-9548-qrrj-x5pj