Home / mailings [SECURITY] [DSA 6105-1] modsecurity-crs security update
Posted on 21 January 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6105-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
January 21, 2026 https://www.debian.org/security/faq
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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/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: debian-security-announce@lists.debian.org
