A webkit2gtk security update has been released for Debian GNU/Linux 10 and 11 to address multiple vulnerabilities.

DSA 5030-1: webkit2gtk security update

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Debian Security Advisory DSA-5030-1 security@debian.org
  https://www.debian.org/security/ Alberto Garcia
December 23, 2021   https://www.debian.org/security/faq
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Package : webkit2gtk
CVE ID : CVE-2021-30887 CVE-2021-30890

The following vulnerabilities have been discovered in the webkit2gtk
web engine:

CVE-2021-30887

Narendra Bhati discovered that processing maliciously crafted web
content may lead to unexpectedly unenforced Content Security
Policy.

CVE-2021-30890

An anonymous researcher discovered that processing maliciously
crafted web content may lead to universal cross site scripting.

For the oldstable distribution (buster), these problems have been fixed
in version 2.34.3-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 2.34.3-1~deb11u1.

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/