A libzstd security update has been released for Debian GNU/Linux 10 to address an issue where zstd temporarily exposed a world-readable version of its input even if the original file had restrictive permissions.

DSA 4850-1: libzstd security update

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Debian Security Advisory DSA-4850-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
February 10, 2021   https://www.debian.org/security/faq
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Package : libzstd
Debian Bug : 981404

It was discovered that zstd, a compression utility, temporarily
exposed a world-readable version of its input even if the original
file had restrictive permissions.

For the stable distribution (buster), this problem has been fixed in
version 1.3.8+dfsg-3+deb10u1.

We recommend that you upgrade your libzstd packages.

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

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/