Bug 2543134 (CVE-2026-100819) - CVE-2026-100819 firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component
Summary: CVE-2026-100819 firefox: thunderbird: Sandbox escape due to incorrect boundar...
Keywords:
Status: NEW
Alias: CVE-2026-100819
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-29 12:59 UTC by OSIDB Bzimport
Modified: 2026-10-19 16:38 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 06:35:13 UTC
Red Hat Product Errata RHSA-2026:76764 0 None None None 2026-10-06 20:18:49 UTC
Red Hat Product Errata RHSA-2026:76850 0 None None None 2026-10-06 19:18:34 UTC
Red Hat Product Errata RHSA-2026:80674 0 None None None 2026-10-12 09:20:57 UTC
Red Hat Product Errata RHSA-2026:80694 0 None None None 2026-10-12 10:28:44 UTC
Red Hat Product Errata RHSA-2026:85240 0 None None None 2026-10-19 16:08:26 UTC
Red Hat Product Errata RHSA-2026:85241 0 None None None 2026-10-19 16:21:37 UTC
Red Hat Product Errata RHSA-2026:85242 0 None None None 2026-10-19 16:20:18 UTC
Red Hat Product Errata RHSA-2026:85243 0 None None None 2026-10-19 16:26:32 UTC
Red Hat Product Errata RHSA-2026:85244 0 None None None 2026-10-19 16:38:54 UTC

Description OSIDB Bzimport 2026-09-29 12:59:31 UTC 
Sandbox escape due to incorrect boundary conditions in the XPCOM 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 19:18:34 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 20:18:48 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 3 Jon Orris 2026-10-08 06:35:12 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 4 Jon Orris 2026-10-12 09:20:56 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 5 Jon Orris 2026-10-12 10:28:43 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 6 Jon Orris 2026-10-19 16:08:25 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 7 Jon Orris 2026-10-19 16:20:17 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 8 Jon Orris 2026-10-19 16:21:36 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 9 Jon Orris 2026-10-19 16:26:30 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 10 Jon Orris 2026-10-19 16:38:52 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
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