Bug 2521858 (CVE-2026-78376)

Summary:	CVE-2026-78376 webkitgtk: use-after-free of JSCValue function parameters
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	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.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2521961, 2521962
Bug Blocks:

Description OSIDB Bzimport 2026-08-24 13:14:52 UTC

A use-after-free issue was addressed with improved memory handling. This issue does not affect Apple platforms. Processing maliciously crafted web content may lead to memory corruption.

Comment 2 Jon Orris 2026-09-21 04:56:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:69098 https://access.redhat.com/errata/RHSA-2026:69098

Comment 3 Jon Orris 2026-09-30 19:39:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:74084 https://access.redhat.com/errata/RHSA-2026:74084