In ModSecurity before 2.9.6 and 3.x before 3.0.8, HTTP multipart requests were incorrectly parsed and could bypass the Web Application Firewall. NOTE: this is related to CVE-2022-39956 but can be considered independent changes to the ModSecurity (C language) codebase.
https://github.com/SpiderLabs/ModSecurity/pull/2795
https://github.com/SpiderLabs/ModSecurity/pull/2797
https://github.com/SpiderLabs/ModSecurity/releases/tag/v2.9.6
https://github.com/SpiderLabs/ModSecurity/releases/tag/v3.0.8
https://lists.debian.org/debian-lts-announce/2023/01/msg00023.html