modsecurity-crs: coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not detect multiple Content-Type request headers...
CVE-2023-38199 is fixed in modsecurity-crs on 1 platform, first by DEBIAN-CVE-2023-38199, released July 13, 2023. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| modsecurity-crs · Debian 11.6 (bullseye) | 3.3.4-1~deb11u2 | DLA-4488-1 | Feb 22, 2026 |
| modsecurity-crs · Debian 12.15 (bookworm) | 3.3.4-1+deb12u2 | DEBIAN-CVE-2023-38199 | Jul 13, 2023 |
| modsecurity-crs · Debian 13.5 (trixie) | 3.3.5-1 | DEBIAN-CVE-2023-38199 | Jul 13, 2023 |
| modsecurity-crs · Debian 14 | 3.3.5-1 | DEBIAN-CVE-2023-38199 | Jul 13, 2023 |
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