A pywps security update has been released for Debian GNU/Linux 9 LTS to address an XML external entity (XXE) injection.

DLA 2754-1: pywps security update

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Debian LTS Advisory DLA-2754-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Abhijith PA
September 04, 2021   https://wiki.debian.org/LTS
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Package : pywps
Version : 4.0.0-3+deb9u1
CVE ID : CVE-2021-39371

An XML external entity (XXE) injection in pywps allows an attacker to
view files on the application server filesystem by assigning a path
to the entity.

For Debian 9 stretch, this problem has been fixed in version
4.0.0-3+deb9u1.

We recommend that you upgrade your pywps packages.

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

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