A pypdf2 security update has been released for Debian GNU/Linux 9 LTS to address an issue that can force PyPDF2 into an infinite loop.

DLA 3039-1: pypdf2 security update

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Debian LTS Advisory DLA-3039-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
June 03, 2022   https://wiki.debian.org/LTS
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Package : pypdf2
Version : 1.26.0-2+deb9u1
CVE ID : CVE-2022-24859
Debian Bug : 1009879

Sebastian Krause discovered that manipulated inline images can force
PyPDF2, a pure Python PDF library, into an infinite loop, if a maliciously
crafted PDF file is processed.

For Debian 9 stretch, this problem has been fixed in version
1.26.0-2+deb9u1.

We recommend that you upgrade your pypdf2 packages.

For the detailed security status of pypdf2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/pypdf2

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