An ujson security update has been released for Debian GNU/Linux 9 LTS to address a stack-based buffer overflow in Buffer_AppendIndentUnchecked.

DLA 2929-1: ujson security update

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Debian LTS Advisory DLA-2929-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
February 26, 2022   https://wiki.debian.org/LTS
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Package : ujson
Version : 1.35-1+deb9u1
CVE ID : CVE-2021-45958

One issue have been discovered in ujson: ultra fast JSON encoder and decoder for Python.

CVE-2021-45958

Stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode) has
been detected. Exploitation can, for example, use a large amount of indentation.

For Debian 9 stretch, this problem has been fixed in version
1.35-1+deb9u1.

We recommend that you upgrade your ujson packages.

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

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