It was discovered that zstd, a compression utility, was vulnerable to
a race condition: it temporarily exposed, during a very short
timeframe, 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
We recommend that you upgrade your libzstd packages.
For the detailed security status of libzstd please refer to
its security tracker page at:
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: [email protected]
Debian Security Advisory DSA-4859-1 [email protected]
https://www.debian.org/security/ Sebastien Delafond
February 20, 2021 https://www.debian.org/security/faq