In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
Vector
NETWORK
Complexity
LOW
Authentication
NONE
Confidentiality
NONE
Integrity
PARTIAL
Availability
NONE