CVE-2022-39956

The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set
bypass for HTTP multipart requests by submitting a payload that uses a
character encoding scheme via the Content-Type or the deprecated
Content-Transfer-Encoding multipart MIME header fields that will not be
decoded and inspected by the web application firewall engine and the rule
set. The multipart payload will therefore bypass detection. A vulnerable
backend that supports these encoding schemes can potentially be exploited.
The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the
currently supported versions 3.2.1 and 3.3.2. Integrators and users are
advised upgrade to 3.2.2 and 3.3.3 respectively. The mitigation against
these vulnerabilities depends on the installation of the latest ModSecurity
version (v2.9.6 / v3.0.8).