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

DSA 4789-1: codemirror-js security update

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Debian Security Advisory DSA-4789-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
November 12, 2020   https://www.debian.org/security/faq
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Package : codemirror-js
CVE ID : CVE-2020-7760

It was discovered that codemirror, a browser-based text editor
implemented in JavaScript, was vulnerable to regular expression
denial-of-service.

For the stable distribution (buster), this problem has been fixed in
version 5.43.0-1+deb10u1.

We recommend that you upgrade your codemirror-js packages.

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

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/