Bug 2543157 (CVE-2026-100778) - CVE-2026-100778 firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component
Summary: CVE-2026-100778 firefox: Sandbox escape due to use-after-free in the DOM: Cor...
Keywords:
Status: NEW
Alias: CVE-2026-100778
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: 2026-09-29 13:08 UTC by OSIDB Bzimport
Modified: 2026-10-08 06:35 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-2026:76761 0 None None None 2026-10-08 06:35:28 UTC
Red Hat Product Errata RHSA-2026:76764 0 None None None 2026-10-06 20:19:04 UTC
Red Hat Product Errata RHSA-2026:76850 0 None None None 2026-10-06 19:19:02 UTC

Description OSIDB Bzimport 2026-09-29 13:08:14 UTC 
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Comment 1 Jon Orris 2026-10-06 19:19:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:76850 https://access.redhat.com/errata/RHSA-2026:76850
Comment 2 Jon Orris 2026-10-06 19:19:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:76850 https://access.redhat.com/errata/RHSA-2026:76850
Comment 3 Jon Orris 2026-10-06 20:19:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:76764 https://access.redhat.com/errata/RHSA-2026:76764
Comment 4 Jon Orris 2026-10-08 06:35:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:76761 https://access.redhat.com/errata/RHSA-2026:76761
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