A webkit2gtk security update has been released for Debian GNU/Linux 10 and 11 to address an issue that may lead to arbitrary code execution.

DSA 4975-1: webkit2gtk security update

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Debian Security Advisory DSA-4975-1 security@debian.org
  https://www.debian.org/security/ Alberto Garcia
September 20, 2021   https://www.debian.org/security/faq
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Package : webkit2gtk
CVE ID : CVE-2021-30858

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

CVE-2021-30858
An anonymous researcher discovered that processing maliciously
crafted web content may lead to arbitrary code execution. Apple is
aware of a report that this issue may have been actively
exploited.

For the oldstable distribution (buster), this problem has been fixed
in version 2.32.4-1~deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 2.32.4-1~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/