A prosody regression update has been released for Debian GNU/Linux 10 to address a regression in websocket support introduced by the previous update.

DSA 4916-2: prosody regression update

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Debian Security Advisory DSA-4916-2 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 21, 2021   https://www.debian.org/security/faq
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Package : prosody
Debian Bug : 988756

The update for prosody released as DSA 4916-1 introduced a regression
in websocket support. Updated prosody packages are now available to
correct this issue.

For the stable distribution (buster), these problems have been fixed in
version 0.11.2-1+deb10u2.

We recommend that you upgrade your prosody packages.

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

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/