A webkit2gtk regression update has been released for Debian GNU/Linux 10to address a regression with the WebSockets functionality that was introduced in the previous update.

DSA 4797-2: webkit2gtk regression update

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Debian Security Advisory DSA-4797-2 security@debian.org
  https://www.debian.org/security/ Alberto Garcia
December 22, 2020   https://www.debian.org/security/faq
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Package : webkit2gtk
Debian Bug : 976437

The update for webkit2gtk released as 4797-1 introduced a regression
with the WebSockets functionality. Updated webkit2gtk packages are now
available to correct this issue.

For the stable distribution (buster), this problem has been fixed in
version 2.30.4-1~deb10u1.

We recommend that you upgrade your webkit2gtk packages.

For the detailed security status of webkit2gtk please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/webkit2gtk

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/