A nss security update has been released for Debian GNU/Linux 10 to address several vulnerabilities which may result in side channel/timing attacks or denial of service.

DSA 4726-1: nss security update

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Debian Security Advisory DSA-4726-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
July 17, 2020   https://www.debian.org/security/faq
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Package : nss
CVE ID : CVE-2019-17006 CVE-2019-17023 CVE-2020-12399 CVE-2020-12402

Several vulnerabilities were discovered in NSS, a set of cryptographic
libraries, which may result in side channel/timing attacks or denial
of service.

For the stable distribution (buster), these problems have been fixed in
version 2:3.42.1-1+deb10u3.

We recommend that you upgrade your nss packages.

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

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/