What’s Vulnerable › Vulnerabilities

CVE-2026-78376: Webkitgtk: use-after-free of jscvalue function parameters

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-29
• Weakness: CWE-416

Description

A flaw was found in WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.

Affected products

• Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:2.54.0-1.el7_9
• Red Hat Enterprise Linux 8: all versions — fixed in 0:2.54.0-1.el8_10
• Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:2.54.0-1.el8_6
• Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:2.54.0-1.el8_6
• Red Hat Enterprise Linux 9: all versions — fixed in 0:2.54.0-1.el9_8
• Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:2.54.0-1.el9_2
• Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:2.54.0-1.el9_4
• Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:2.54.0-1.el9_6
• WebKit: from 2.21.1
• Webkit: from 2.21.1

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.54.0-1.el7_9; Red Hat Enterprise Linux 8 0:2.54.0-1.el8_10; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.54.0-1.el8_6; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.54.0-1.el8_6; Red Hat Enterprise Linux 9 0:2.54.0-1.el9_8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.54.0-1.el9_2; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.54.0-1.el9_4; Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.54.0-1.el9_6. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:69098
• https://access.redhat.com/errata/RHSA-2026:74084
• https://access.redhat.com/errata/RHSA-2026:89821
• https://access.redhat.com/errata/RHSA-2026:89822
• https://access.redhat.com/errata/RHSA-2026:91631
• https://access.redhat.com/errata/RHSA-2026:92216
• https://access.redhat.com/errata/RHSA-2026:92339
• https://access.redhat.com/security/cve/CVE-2026-78376
• https://bugzilla.redhat.com/show_bug.cgi?id=2521858
• https://github.com/WebKit/WebKit/pull/72142

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