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CVE-2026-78376

Webkitgtk: use-after-free of jscvalue function parameters

HIGH
8.8
CVSS Score
Published: August 24, 2026 at 01:29 PM UTC
Updated: October 26, 2026 at 02:16 PM UTC
3 products affected across 3 vendorsEnterprise LinuxWebKitGTKWebKit

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Severity
HIGH8.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Enterprise Linux· Red Hatrpm
90%
All versions7
Vendor states this is fixed in 0:2.54.0-1.el8_10 (unaffected)
Vendor states this is fixed in 0:2.54.0-1.el9_8 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 6 (unknown)
WebKit· Webkit
90%
2.21.1 ≤ v < *2.21.1
WebKitGTK· Webkitgtk
90%
2.21.1 ≤ v < *2.21.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

VDB Entryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-78376
Issue Trackingx_refsource_REDHAT
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2521858
Source: cverecord
https://github.com/WebKit/WebKit/pull/72142
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:69098
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:74084
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:89821

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-416

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