A modsecurity security update has been released for Debian GNU/Linux 10 to address a denial of service issue.

DSA 4765-1: modsecurity security update

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Debian Security Advisory DSA-4765-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
September 18, 2020   https://www.debian.org/security/faq
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Package : modsecurity
CVE ID : CVE-2020-15598

Ervin Hegedues discovered that ModSecurity v3 enabled global regular
expression matching which could result in denial of service. For
additional information please refer to
  https://coreruleset.org/20200914/cve-2020-15598/

For the stable distribution (buster), this problem has been fixed in
version 3.0.3-1+deb10u2.

We recommend that you upgrade your modsecurity packages.

For the detailed security status of modsecurity please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/modsecurity

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/