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Debian: modsecurity-crs Critical Fix for CVE-2026-21876 DSA-6105-1

It was discovered that one of the rules in the OWASP ModSecurity Core Rule Set parsed some multipart requests incorrectly. For the oldstable distribution (bookworm), this problem has been fixed in version 3.3.4-1+deb12u1. For the stable distribution (trixie), this problem has been fixed in. - ------------------------------------------------------------------------- Debian Security Advisory DSA-6105-1 This email address is being protected from spambots. You need JavaScript enabled to view it. https://www.debian.org/security/ Moritz Muehlenhoff January 21, 2026 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : modsecurity-crs CVE ID : CVE-2026-21876 It was discovered that one of the rules in the OWASP ModSecurity Core Rule Set parsed some multipart requests incorrectly. For the oldstable distribution (bookworm), this problem has been fixed in version 3.3.4-1+deb12u1. For the stable distribution (trixie), this problem has been fixed in version 3.3.7-1+deb13u1. We recommend that you upgrade your modsecurity-crs packages. For the detailed security status of modsecurity-crs please refer to its security tracker page at: https://security-tracker.debian.org/tracker/source-package/modsecurity-crs Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Critical advisory for modsecurity-crs in Debian mitigating improper parsing issues. Upgrade recommended for stability.. Debian, ModSecurity, Security Advisory, Update, CVE-2026-21876. . Severity: Critical. LinuxSecurity.com Team

Jan 21, 2026 •Critical Debian