CVE-2023-38199

coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not
detect multiple Content-Type request headers on some platforms. This might
allow attackers to bypass a WAF with a crafted payload, aka “Content-Type
confusion” between the WAF and the backend application. This occurs when
the web application relies on only the last Content-Type header. Other
platforms may reject the additional Content-Type header or merge
conflicting headers, leading to detection as a malformed header.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1041109&gt;