A pypy3 security update has been released for Debian GNU/Linux 11 to address a buffer overflow.

DSA 5269-1: pypy3 security update

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Debian Security Advisory DSA-5269-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 02, 2022   https://www.debian.org/security/faq
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Package : pypy3
CVE ID : CVE-2022-37454

Nicky Mouha discovered a buffer overflow in the sha3 module of PyPy, a
fast, compliant alternative implementation of the Python language.

For the stable distribution (bullseye), this problem has been fixed in
version 7.3.5+dfsg-2+deb11u2.

We recommend that you upgrade your pypy3 packages.

For the detailed security status of pypy3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/pypy3

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/