CVE-2026-78376

Webkitgtk: use-after-free of jscvalue function parameters

State: Published
Severity: 8.8 High
Published: Aug 24, 2026
Updated: Nov 2, 2026
Reserved: Aug 24, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
WebKitWebKit	2.21.1 and laterAffected
WebKitGTKWebKitGTK	2.21.1 and laterAffected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:2.54.0-1.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.54.0-1.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.54.0-1.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.54.0-1.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.54.0-1.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.54.0-1.el8_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.54.0-1.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.54.0-1.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.54.0-1.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.54.0-1.el9_6 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat

References

RHSA-2026:69098vendor-advisory
RHSA-2026:74084vendor-advisory
RHSA-2026:89821vendor-advisory
RHSA-2026:89822vendor-advisory
RHSA-2026:91631vendor-advisory
RHSA-2026:92216vendor-advisory
RHSA-2026:92339vendor-advisory
RHSA-2026:93435vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-78376vdb-entry
RHBZ#2521858issue-tracking
https://github.com/WebKit/WebKit/pull/72142

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