RHSA-2026:59325 - Security Advisory

Topic

An update for webkit2gtk3 is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

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):

• Mozilla: Arbitrary JavaScript execution in PDF.js (CVE-2024-4367)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-39872)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43663)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43676)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43699)
• webkitgtk: webkitgtk: A malicious website may process restricted web content outside the sandbox (CVE-2026-43701)
• webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption (CVE-2026-43705)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43707)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43712)
• webkitgtk: webkitgtk: Visiting a website may leak sensitive data (CVE-2026-43713)
• webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption (CVE-2026-43715)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43716)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43720)
• webkitgtk: webkitgtk: A malicious website may silently hijack clipboard data (CVE-2026-43721)
• webkitgtk: webkitgtk: A malicious website may process restricted web content outside the sandbox (CVE-2026-43725)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43726)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43727)
• webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption (CVE-2026-43731)
• webkitgtk: webkitgtk: Maliciously crafted web content may disclose sensitive user information (CVE-2026-43732)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43734)
• webkitgtk: webkitgtk: Maliciously crafted web content may disclose process memory (CVE-2026-43740)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43742)
• webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash (CVE-2026-43745)
• webkitgtk: Processing maliciously crafted web content may lead to an unexpected process termination (CVE-2026-64787)

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

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64

Fixes

• BZ - 2280382 - CVE-2024-4367 Mozilla: Arbitrary JavaScript execution in PDF.js
• BZ - 2500519 - CVE-2026-39872 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500520 - CVE-2026-43663 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500521 - CVE-2026-43676 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500522 - CVE-2026-43699 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500523 - CVE-2026-43701 webkitgtk: webkitgtk: A malicious website may process restricted web content outside the sandbox
• BZ - 2500524 - CVE-2026-43705 webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption
• BZ - 2500525 - CVE-2026-43707 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500526 - CVE-2026-43712 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500527 - CVE-2026-43713 webkitgtk: webkitgtk: Visiting a website may leak sensitive data
• BZ - 2500528 - CVE-2026-43715 webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption
• BZ - 2500529 - CVE-2026-43716 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500530 - CVE-2026-43720 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500531 - CVE-2026-43721 webkitgtk: webkitgtk: A malicious website may silently hijack clipboard data
• BZ - 2500532 - CVE-2026-43725 webkitgtk: webkitgtk: A malicious website may process restricted web content outside the sandbox
• BZ - 2500533 - CVE-2026-43726 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500534 - CVE-2026-43727 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500535 - CVE-2026-43731 webkitgtk: webkitgtk: Maliciously crafted web content may lead to memory corruption
• BZ - 2500536 - CVE-2026-43732 webkitgtk: webkitgtk: Maliciously crafted web content may disclose sensitive user information
• BZ - 2500537 - CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500538 - CVE-2026-43740 webkitgtk: webkitgtk: Maliciously crafted web content may disclose process memory
• BZ - 2500539 - CVE-2026-43742 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2500540 - CVE-2026-43745 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
• BZ - 2520320 - CVE-2026-64787 webkitgtk: Processing maliciously crafted web content may lead to an unexpected process termination

CVEs

• CVE-2024-4367
• CVE-2026-39872
• 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-2026-64787

References

• https://access.redhat.com/security/updates/classification/#important