Debian DSA-4627-1 Critical: Webkit2gtk Denial of Service Threat

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

CVE-2020-3862

Srikanth Gatta discovered that a malicious website may be able to
cause a denial of service.

CVE-2020-3864

Ryan Pickren discovered that a DOM object context may not have had
a unique security origin.

CVE-2020-3865

Ryan Pickren discovered that a top-level DOM object context may
have incorrectly been considered secure.

CVE-2020-3867

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

CVE-2020-3868

Marcin Towalski discovered that processing maliciously crafted web
content may lead to arbitrary code execution.

For the stable distribution (buster), these problems have been fixed in
version 2.26.4-1~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/source...