A libxml2 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities which could cause denial of service via application crash when parsing specially crafted files.

DLA 2653-1: libxml2 security update

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Debian LTS Advisory DLA-2653-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
May 10, 2021   https://wiki.debian.org/LTS
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Package : libxml2
Version : 2.9.4+dfsg1-2.2+deb9u4
CVE ID : CVE-2021-3516 CVE-2021-3517 CVE-2021-3518 CVE-2021-3537

Several vulnerabilities were discovered in libxml2, a library providing
support to read, modify and write XML and HTML files, which could cause
denial of service via application crash when parsing specially crafted
files.

For Debian 9 stretch, these problems have been fixed in version
2.9.4+dfsg1-2.2+deb9u4.

We recommend that you upgrade your libxml2 packages.

For the detailed security status of libxml2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libxml2

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