A underscore security update has been released for Debian GNU/Linux 9 LTS to address an issue with arbitrary code execution.

DLA 2613-1: underscore security update

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Debian LTS Advisory DLA-2613-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Yadd
March 31, 2021   https://wiki.debian.org/LTS
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Package : underscore
Version : 1.8.3~dfsg-1+deb9u1
CVE ID : CVE-2021-23358
Debian Bug : 986171

node-underscore and libjs-underscore are vulnerable to Arbitrary Code
Execution via the template function, particulary when a variable
property is passed as an argument as it is not sanitized.

For Debian 9 stretch, this problem has been fixed in version
1.8.3~dfsg-1+deb9u1.

We recommend that you upgrade your underscore packages.

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

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