Bug 2526781 (CVE-2026-84143) - CVE-2026-84143 firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15
Summary: CVE-2026-84143 firefox: Internally found bugs fixed in Firefox 155, Firefox E...
Keywords:
Status: NEW
Alias: CVE-2026-84143
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-01 12:50 UTC by OSIDB Bzimport
Modified: 2026-10-13 08:48 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 13:41:18 UTC
Red Hat Product Errata RHSA-2026:67133 0 None None None 2026-09-14 13:40:55 UTC
Red Hat Product Errata RHSA-2026:68549 0 None None None 2026-09-17 07:49:27 UTC
Red Hat Product Errata RHSA-2026:70642 0 None None None 2026-09-24 01:58:09 UTC
Red Hat Product Errata RHSA-2026:73130 0 None None None 2026-09-29 12:15:28 UTC
Red Hat Product Errata RHSA-2026:73971 0 None None None 2026-09-30 14:19:29 UTC
Red Hat Product Errata RHSA-2026:76740 0 None None None 2026-10-06 13:26:34 UTC
Red Hat Product Errata RHSA-2026:76741 0 None None None 2026-10-06 13:07:26 UTC
Red Hat Product Errata RHSA-2026:76742 0 None None None 2026-10-06 13:08:13 UTC
Red Hat Product Errata RHSA-2026:76745 0 None None None 2026-10-06 13:14:20 UTC
Red Hat Product Errata RHSA-2026:76746 0 None None None 2026-10-06 13:16:34 UTC
Red Hat Product Errata RHSA-2026:76894 0 None None None 2026-10-06 17:31:00 UTC
Red Hat Product Errata RHSA-2026:76895 0 None None None 2026-10-06 21:08:06 UTC
Red Hat Product Errata RHSA-2026:77610 0 None None None 2026-10-07 13:53:25 UTC
Red Hat Product Errata RHSA-2026:77627 0 None None None 2026-10-07 16:04:20 UTC
Red Hat Product Errata RHSA-2026:77631 0 None None None 2026-10-07 15:21:38 UTC
Red Hat Product Errata RHSA-2026:77632 0 None None None 2026-10-07 14:26:31 UTC
Red Hat Product Errata RHSA-2026:80503 0 None None None 2026-10-12 01:45:49 UTC
Red Hat Product Errata RHSA-2026:81912 0 None None None 2026-10-13 05:01:03 UTC
Red Hat Product Errata RHSA-2026:81913 0 None None None 2026-10-13 04:59:01 UTC
Red Hat Product Errata RHSA-2026:82122 0 None None None 2026-10-13 08:48:35 UTC

Description OSIDB Bzimport 2026-09-01 12:50:11 UTC 
Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.
Comment 1 Jon Orris 2026-09-14 13:40:55 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 13:41:17 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
Comment 3 Jon Orris 2026-09-17 07:49:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68549 https://access.redhat.com/errata/RHSA-2026:68549
Comment 4 Jon Orris 2026-09-24 01:58:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:70642 https://access.redhat.com/errata/RHSA-2026:70642
Comment 5 Jon Orris 2026-09-29 12:15:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:73130 https://access.redhat.com/errata/RHSA-2026:73130
Comment 6 Jon Orris 2026-09-30 14:19:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:73971 https://access.redhat.com/errata/RHSA-2026:73971
Comment 7 Jon Orris 2026-10-06 13:07:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:76741 https://access.redhat.com/errata/RHSA-2026:76741
Comment 8 Jon Orris 2026-10-06 13:08:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:76742 https://access.redhat.com/errata/RHSA-2026:76742
Comment 9 Jon Orris 2026-10-06 13:14:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:76745 https://access.redhat.com/errata/RHSA-2026:76745
Comment 10 Jon Orris 2026-10-06 13:16:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:76746 https://access.redhat.com/errata/RHSA-2026:76746
Comment 11 Jon Orris 2026-10-06 13:26:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:76740 https://access.redhat.com/errata/RHSA-2026:76740
Comment 12 Jon Orris 2026-10-06 17:30:59 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-2026:76894 https://access.redhat.com/errata/RHSA-2026:76894
Comment 13 Jon Orris 2026-10-06 21:08:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:76895 https://access.redhat.com/errata/RHSA-2026:76895
Comment 14 Jon Orris 2026-10-07 13:53:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:77610 https://access.redhat.com/errata/RHSA-2026:77610
Comment 15 Jon Orris 2026-10-07 14:26:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:77632 https://access.redhat.com/errata/RHSA-2026:77632
Comment 16 Jon Orris 2026-10-07 15:21:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:77631 https://access.redhat.com/errata/RHSA-2026:77631
Comment 17 Jon Orris 2026-10-07 16:04:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:77627 https://access.redhat.com/errata/RHSA-2026:77627
Comment 18 Jon Orris 2026-10-12 01:45:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:80503 https://access.redhat.com/errata/RHSA-2026:80503
Comment 20 Jon Orris 2026-10-13 04:58:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:81913 https://access.redhat.com/errata/RHSA-2026:81913
Comment 21 Jon Orris 2026-10-13 05:01:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:81912 https://access.redhat.com/errata/RHSA-2026:81912
Comment 22 Jon Orris 2026-10-13 08:48:34 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-2026:82122 https://access.redhat.com/errata/RHSA-2026:82122
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