High severity · published Aug 24, 2026
CVE-2026-78376
Webkitgtk: use-after-free of jscvalue function parameters
8.8
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9.6 Extended Update Support · Red Hat
All versions, or not specified · source: vendor
WE
WebKit · WebKit
2.21.1 · source: vendor
WE
WebKitGTK · WebKitGTK
2.21.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78376
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78376
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:69098
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:74084
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:89821
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-78376
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2521858
github.com
https://github.com/WebKit/WebKit/pull/72142
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