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WebKitGTK CVE-2026-78376

| EUVDEUVD-2026-64858 HIGH
Use After Free (CWE-416)
2026-08-24 redhat GHSA-qcc7-6r53-qpph
8.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Web content delivery is network-based (AV:N), exploitation complexity is low once content is visited (AC:L), no attacker privileges required (PR:N), user must open the page (UI:R), no inherent scope change without chaining (S:U), and memory corruption enables full triad compromise (C:H/I:H/A:H).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

2
Analysis Generated
Aug 24, 2026 - 14:16 vuln.today
CVE Published
Aug 24, 2026 - 13:29 cve.org
HIGH 8.8

DescriptionCVE.org

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.

AnalysisAI

Use-after-free memory corruption in WebKitGTK exposes Red Hat Enterprise Linux 6 through 9 systems to potential arbitrary code execution when users process attacker-controlled web content. The flaw (CWE-416) stems from improper memory management in the web engine's content rendering pipeline, where a freed heap allocation is subsequently accessed, enabling heap corruption. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts crafted malicious web content
Delivery
Victim on RHEL system opens attacker URL in WebKitGTK-based application
Exploit
Malicious content triggers use-after-free in rendering engine
Execution
Freed heap region reused with attacker-controlled data via heap grooming
Persist
Stale pointer dereference redirects execution
Impact
Arbitrary code executed in browser process

Vulnerability AssessmentAI

Exploitation Exploitation requires a user on an affected RHEL 6-9 system to actively process attacker-controlled web content using a WebKitGTK-based application (UI:R per CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects high severity with low exploitation complexity, but the UI:R requirement is the primary gating factor - the attacker must induce a user to process malicious web content rather than achieving exploitation passively. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker registers a domain and hosts a page containing crafted HTML, JavaScript, or media content engineered to trigger the use-after-free condition in WebKitGTK's rendering engine. A user on an affected RHEL system opens the URL in GNOME Web or another WebKitGTK-based application; the engine frees a heap object during content processing but retains a stale pointer to it, which is then accessed, corrupting heap metadata. …
Remediation No vendor-released patch version has been independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all systems running WebKitGTK across RHEL 6, 7, 8, and 9 environments and map dependent applications to identify business-critical services. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-78376 vulnerability details – vuln.today

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