Bug 2526753 (CVE-2026-84121) - CVE-2026-84121 firefox: Sandbox escape due to use-after-free in the DOM: Security component
Summary: CVE-2026-84121 firefox: Sandbox escape due to use-after-free in the DOM: Secu...
Keywords:
Status: NEW
Alias: CVE-2026-84121
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-01 12:41 UTC by OSIDB Bzimport
Modified: 2026-09-14 13:40 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:67129 0 None None None 2026-09-14 13:40:50 UTC
Red Hat Product Errata RHSA-2026:67133 0 None None None 2026-09-14 13:40:42 UTC

Description OSIDB Bzimport 2026-09-01 12:41:30 UTC 
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.
Comment 1 Jon Orris 2026-09-14 13:40:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:67133 https://access.redhat.com/errata/RHSA-2026:67133
Comment 2 Jon Orris 2026-09-14 13:40:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:67129 https://access.redhat.com/errata/RHSA-2026:67129
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