ESB-2026.4346 — Vulnetix

ESB-2026.4346 PUBLISHED CVSS 8.800000190734863 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4346 webkit2gtk3 security update 29 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: webkit2gtk3 Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-20691 CVE-2026-20643 CVE-2025-43214 CVE-2025-43213 CVE-2026-20676 CVE-2025-46299 CVE-2025-43457 CVE-2026-20644 CVE-2026-20636 CVE-2025-43511 CVE-2026-20635 CVE-2026-20652 CVE-2026-20608 CVE-2026-20665 CVE-2026-28871 CVE-2026-20664 CVE-2026-28857 CVE-2026-28859 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:11329 Comment: CVSS (Max): 8.8 CVE-2026-28859 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H EPSS (Max): 0.4% (62nd) CVE-2025-43214 2026-04-27 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:11329 - Security Advisory Issued: 2026-04-28 Updated: 2026-04-28 Synopsis Webkit2gtk3 security update Type/Severity Security Advisory: Important Topic An update for webkit2gtk3 is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description WebKitGTK is the port of the portable web rendering engine WebKit to the GTK platform. Security Fix(es): o webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash (CVE-2025-43213) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash (CVE-2025-43214) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash (CVE-2025-43457) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2025-43511) o webkitgtk: Processing maliciously crafted web content may disclose internal states of the app (CVE-2025-46299) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-20608) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-20635) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-20636) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-20644) o webkitgtk: A remote attacker may be able to cause a denial-of-service (CVE-2026-20652) o webkitgtk: A website may be able to track users through Safari web extensions (CVE-2026-20676) o webkitgtk: Processing maliciously crafted web content may bypass Same Origin Policy (CVE-2026-20643) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-20664) o webkitgtk: Processing maliciously crafted web content may prevent Content Security Policy from being enforced (CVE-2026-20665) o webkitgtk: A maliciously crafted webpage may be able to fingerprint the user (CVE-2026-20691) o webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash (CVE-2026-28857) o webkitgtk: A malicious website may be able to process restricted web content outside the sandbox (CVE-2026-28859) o webkitgtk: Visiting a maliciously crafted website may lead to a cross-site scripting attack (CVE-2026-28871) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products o Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 x86_64 o Red Hat Enterprise Linux Server - AUS 9.6 x86_64 o Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 s390x o Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 ppc64le o Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 aarch64 o Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 ppc64le o Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 x86_64 o Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 aarch64 o Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 s390x o Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 x86_64 o Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 aarch64 o Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 ppc64le o Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 s390x Fixes o BZ - 2448781 - CVE-2025-43213 webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash o BZ - 2448782 - CVE-2025-43214 webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash o BZ - 2448786 - CVE-2025-43457 webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash o BZ - 2448787 - CVE-2025-43511 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2448788 - CVE-2025-46299 webkitgtk: Processing maliciously crafted web content may disclose internal states of the app o BZ - 2448789 - CVE-2026-20608 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2448790 - CVE-2026-20635 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2448791 - CVE-2026-20636 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2448792 - CVE-2026-20644 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2448793 - CVE-2026-20652 webkitgtk: A remote attacker may be able to cause a denial-of-service o BZ - 2448794 - CVE-2026-20676 webkitgtk: A website may be able to track users through Safari web extensions o BZ - 2453000 - CVE-2026-20643 webkitgtk: Processing maliciously crafted web content may bypass Same Origin Policy o BZ - 2453001 - CVE-2026-20664 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2453002 - CVE-2026-20665 webkitgtk: Processing maliciously crafted web content may prevent Content Security Policy from being enforced o BZ - 2453003 - CVE-2026-20691 webkitgtk: A maliciously crafted webpage may be able to fingerprint the user o BZ - 2453004 - CVE-2026-28857 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash o BZ - 2453006 - CVE-2026-28859 webkitgtk: A malicious website may be able to process restricted web content outside the sandbox o BZ - 2453008 - CVE-2026-28871 webkitgtk: Visiting a maliciously crafted website may lead to a cross-site scripting attack CVEs o CVE-2025-43213 o CVE-2025-43214 o CVE-2025-43457 o CVE-2025-43511 o CVE-2025-46299 o CVE-2026-20608 o CVE-2026-20635 o CVE-2026-20636 o CVE-2026-20643 o CVE-2026-20644 o CVE-2026-20652 o CVE-2026-20664 o CVE-2026-20665 o CVE-2026-20676 o CVE-2026-20691 o CVE-2026-28857 o CVE-2026-28859 o CVE-2026-28871 References o https://access.redhat.com/security/updates/classification/#important - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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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 ===========================================================================

Risk Scores

CVSS v3.1

8.800000190734863

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions
Red Hat	webkit2gtk3

Timeline

Apr 28, 2026 CVE Published
Apr 29, 2026 Distribution Patch

References

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