A nss security update has been released for Debian GNU/Linux 9 LTS.

DLA 2836-1: nss security update

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Debian LTS Advisory DLA-2836-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 02, 2021   https://wiki.debian.org/LTS
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Package : nss
Version : 2:3.26.2-1.1+deb9u3
CVE ID : CVE-2021-43527

Tavis Ormandy discovered that nss, the Mozilla Network Security Service
library, is prone to a heap overflow flaw when verifying DSA or RSA-PPS
signatures, which could result in denial of service or potentially the
execution of arbitrary code.

For Debian 9 stretch, this problem has been fixed in version
2:3.26.2-1.1+deb9u3.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS