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High 8.8Published Aug 24, 2026
CVE-2026-78376Webkitgtk: use-after-free of jscvalue function parameters
Updated under an hour ago ()
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It affects WebKit and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
WebKit WebKit webkit:webkit (from the name) | from 2.21.1 | CNA record |
WebKitGTK WebKitGTK webkitgtk:webkitgtk (from the name) | from 2.21.1 | CNA record |
Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux | from 0:2.54.0-1.el8_10 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:69098vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74084vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-78376vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2521858issue-tracking, x-refsource-redhat
- https://github.com/WebKit/WebKit/pull/72142
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.