For Debian 10 buster, this problem has been fixed in version
11.19-0+deb10u1.
We recommend that you upgrade your postgresql-11 packages.
For the detailed security status of postgresql-11 please refer to
its security tracker page at:
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
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