A lilypond security update has been released for Debian GNU/Linux 10.

DSA 4756-1: lilypond security update

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Debian Security Advisory DSA-4756-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
August 29, 2020   https://www.debian.org/security/faq
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Package : lilypond
CVE ID : CVE-2020-17353

Faidon Liambotis discovered that Lilypond, a program for typesetting
sheet music, did not restrict the inclusion of Postscript and SVG
commands when operating in safe mode, which could result in the
execution of arbitrary code when rendering a typesheet file with
embedded Postscript code.

For the stable distribution (buster), this problem has been fixed in
version 2.19.81+really-2.18.2-13+deb10u1.

We recommend that you upgrade your lilypond packages.

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

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/