A node-bl security update has been released for Debian GNU/Linux 9 LTS to address a buffer over-read.

DLA 2698-1: node-bl security update

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Debian LTS Advisory DLA-2698-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
July 01, 2021   https://wiki.debian.org/LTS
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Package : node-bl
Version : 1.1.2-1+deb9u1
CVE ID : CVE-2020-8244

An issue has been found in node-bl, a Node.js module to access multiple
buffers with Buffer interface.
Due to a buffer over-read, uninitialized memory might be exposed by
providing crafted user input.

For Debian 9 stretch, this problem has been fixed in version
1.1.2-1+deb9u1.

We recommend that you upgrade your node-bl packages.

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

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