CVE-2026-78376
Webkitgtk: use-after-free of jscvalue function parameters
CVSS Score
8.8
EPSS Score
0.3%
EPSS Percentile
19th
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.
| CWE | CWE-416 |
| Vendor | webkit |
| Product | webkit |
| Published | Aug 24, 2026 |
| Last Updated | Sep 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
WebKit / WebKit
2.21.1 < *
WebKitGTK / WebKitGTK
2.21.1 < *
Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:69098 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:74084 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-78376 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2521858 github.com: https://github.com/WebKit/WebKit/pull/72142
Credits
Red Hat would like to thank Igalia for reporting this issue.