ESB-2026.4755

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4755 USN-8237-1: WebKitGTK vulnerabilities 7 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: WebKitGTK Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-20652 CVE-2026-20608 CVE-2026-20676 CVE-2026-20644 CVE-2026-20636 CVE-2026-20635 CVE-2026-20643 CVE-2025-43214 CVE-2025-43213 CVE-2025-43457 CVE-2025-43511 CVE-2026-20665 CVE-2026-28871 CVE-2026-20664 CVE-2026-28857 CVE-2026-28861 CVE-2026-28859 CVE-2026-20691 CVE-2025-46299 Original Bulletin: https://ubuntu.com/security/notices/USN-8237-1 Comment: CVSS (Max): 7.5 CVE-2026-20652 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 0.4% (62nd) CVE-2025-43214 2026-05-06 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8237-1: WebKitGTK vulnerabilities Publication date 6 May 2026 Overview Several security issues were fixed in WebKitGTK. Releases 26.04 LTS 25.10 24.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o 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 Release Package Version libjavascriptcoregtk-4.1-0 - 2.52.3-0ubuntu0.26.04.2 26.04 LTS resolute libjavascriptcoregtk-6.0-1 - 2.52.3-0ubuntu0.26.04.2 libwebkit2gtk-4.1-0 - 2.52.3-0ubuntu0.26.04.2 libwebkitgtk-6.0-4 - 2.52.3-0ubuntu0.26.04.2 libjavascriptcoregtk-4.1-0 - 2.52.3-0ubuntu0.25.10.1 25.10 questing libjavascriptcoregtk-6.0-1 - 2.52.3-0ubuntu0.25.10.1 libwebkit2gtk-4.1-0 - 2.52.3-0ubuntu0.25.10.1 libwebkitgtk-6.0-4 - 2.52.3-0ubuntu0.25.10.1 libjavascriptcoregtk-4.1-0 - 2.52.3-0ubuntu0.24.04.1 24.04 LTS noble libjavascriptcoregtk-6.0-1 - 2.52.3-0ubuntu0.24.04.1 libwebkit2gtk-4.1-0 - 2.52.3-0ubuntu0.24.04.1 libwebkitgtk-6.0-4 - 2.52.3-0ubuntu0.24.04.1 --------------------------------------------------------------------------------- References o CVE-2026-28871 o CVE-2026-28861 o CVE-2026-28859 o CVE-2026-28857 o CVE-2026-20691 o CVE-2026-20676 o CVE-2026-20665 o CVE-2026-20664 o CVE-2026-20652 o CVE-2026-20644 o CVE-2026-20643 o CVE-2026-20636 o CVE-2026-20635 o CVE-2026-20608 o CVE-2025-46299 o CVE-2025-43511 o CVE-2025-43457 o CVE-2025-43214 o CVE-2025-43213 --------------------------------------------------------------------------------- - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================