# CVE-2023-38199: 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.

- Web page: https://patchblox.com/security/cve/CVE-2023-38199
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0075
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 13, 2023

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | modsecurity-crs Debian 11.6 (bullseye) | 3.3.4-1~deb11u2 | [DLA-4488-1](https://patchblox.com/security/data/fix/linux/dla-4488-1.md) | Feb 22, 2026 |
| Linux | modsecurity-crs Debian 12.15 (bookworm) | 3.3.4-1+deb12u2 | [DEBIAN-CVE-2023-38199](https://patchblox.com/security/data/fix/linux/debian-cve-2023-38199.md) | Jul 13, 2023 |
| Linux | modsecurity-crs Debian 13.5 (trixie) | 3.3.5-1 | [DEBIAN-CVE-2023-38199](https://patchblox.com/security/data/fix/linux/debian-cve-2023-38199.md) | Jul 13, 2023 |
| Linux | modsecurity-crs Debian 14 | 3.3.5-1 | [DEBIAN-CVE-2023-38199](https://patchblox.com/security/data/fix/linux/debian-cve-2023-38199.md) | Jul 13, 2023 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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