A lz4 security update has been released for Debian GNU/Linux 9 LTS to address a potential memory corruption vulnerability.

DLA 2657-1: lz4 security update

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Debian LTS Advisory DLA-2657-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
May 12, 2021   https://wiki.debian.org/LTS
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Package : lz4
Version : 0.0~r131-2+deb9u1
CVE ID : CVE-2021-3520
Debian Bug : #987856

It was discovered that there was a potential memory corruption
vulnerability in the lz4 compression algorithm library.

For Debian 9 "Stretch", this problem has been fixed in version
0.0~r131-2+deb9u1.

We recommend that you upgrade your lz4 packages.

For the detailed security status of lz4 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/lz4

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