Bug 2543150 (CVE-2026-100818)

Summary: CVE-2026-100818 firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gotiwari, jhorak, mvyas, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the Widget: Gtk component
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Clone Of: Environment:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-29 13:05:28 UTC
Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

Comment 1 Jon Orris 2026-10-06 19:18:56 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 19:18:56 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 20:18:57 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 2026-10-06 20:18:58 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 5 Jon Orris 2026-10-08 06:35:21 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

Comment 6 Jon Orris 2026-10-12 09:21:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:80674 https://access.redhat.com/errata/RHSA-2026:80674

Comment 7 Jon Orris 2026-10-12 10:28:49 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:80694 https://access.redhat.com/errata/RHSA-2026:80694

Comment 8 Jon Orris 2026-10-19 16:08:34 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:85240 https://access.redhat.com/errata/RHSA-2026:85240

Comment 9 Jon Orris 2026-10-19 16:20:28 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:85242 https://access.redhat.com/errata/RHSA-2026:85242

Comment 10 Jon Orris 2026-10-19 16:21:44 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:85241 https://access.redhat.com/errata/RHSA-2026:85241

Comment 11 Jon Orris 2026-10-19 16:26:38 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:85243 https://access.redhat.com/errata/RHSA-2026:85243

Comment 12 Jon Orris 2026-10-19 16:39:01 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:85244 https://access.redhat.com/errata/RHSA-2026:85244