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[USN-8703-1] WebKitGTK vulnerabilities

Posted on 31 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8703-1
August 31, 2026

webkit2gtk vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in WebKitGTK.

Software Description:
- webkit2gtk: Web content engine library for GTK+

Details:

Several security issues were discovered in the WebKitGTK Web and JavaScript
engines. If a user were tricked into viewing a malicious website, a remote
attacker could exploit a variety of issues related to web browser security,
including cross-site scripting attacks, denial of service attacks, and
arbitrary code execution.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libjavascriptcoregtk-4.1-0 2.52.6-0ubuntu0.26.04.1
libjavascriptcoregtk-6.0-1 2.52.6-0ubuntu0.26.04.1
libwebkit2gtk-4.1-0 2.52.6-0ubuntu0.26.04.1
libwebkitgtk-6.0-4 2.52.6-0ubuntu0.26.04.1

Ubuntu 24.04 LTS
libjavascriptcoregtk-4.1-0 2.52.6-0ubuntu0.24.04.1
libjavascriptcoregtk-6.0-1 2.52.6-0ubuntu0.24.04.1
libwebkit2gtk-4.1-0 2.52.6-0ubuntu0.24.04.1
libwebkitgtk-6.0-4 2.52.6-0ubuntu0.24.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use WebKitGTK, such as Epiphany, to make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8703-1
CVE-2026-28847, CVE-2026-28883, CVE-2026-28901, CVE-2026-28902,
CVE-2026-28903, CVE-2026-28904, CVE-2026-28905, CVE-2026-28907,
CVE-2026-28942, CVE-2026-28946, CVE-2026-28947, CVE-2026-28953,
CVE-2026-28955, CVE-2026-28958, CVE-2026-28984, CVE-2026-39872,
CVE-2026-43658, CVE-2026-43660, CVE-2026-43663, CVE-2026-43676,
CVE-2026-43699, CVE-2026-43701, CVE-2026-43705, CVE-2026-43707,
CVE-2026-43712, CVE-2026-43713, CVE-2026-43715, CVE-2026-43716,
CVE-2026-43720, CVE-2026-43721, CVE-2026-43725, CVE-2026-43726,
CVE-2026-43727, CVE-2026-43731, CVE-2026-43732, CVE-2026-43734,
CVE-2026-43740, CVE-2026-43742, CVE-2026-43745, CVE-2026-43804,
CVE-2026-64713, CVE-2026-64719, CVE-2026-64728, CVE-2026-64730,
CVE-2026-64757, CVE-2026-64783, CVE-2026-64787

Package Information:
https://launchpad.net/ubuntu/+source/webkit2gtk/2.52.6-0ubuntu0.26.04.1
https://launchpad.net/ubuntu/+source/webkit2gtk/2.52.6-0ubuntu0.24.04.1

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