Bug 2428963 (CVE-2026-0891) - CVE-2026-0891 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147
Summary: CVE-2026-0891 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 1...
Keywords:
Status: NEW
Alias: CVE-2026-0891
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: 2026-01-13 14:01 UTC by OSIDB Bzimport
Modified: 2026-02-09 09:26 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-2026:0667 0 None None None 2026-01-15 08:19:16 UTC
Red Hat Product Errata RHSA-2026:0694 0 None None None 2026-01-15 11:47:25 UTC
Red Hat Product Errata RHSA-2026:0924 0 None None None 2026-01-21 11:56:48 UTC
Red Hat Product Errata RHSA-2026:1320 0 None None None 2026-01-27 06:51:13 UTC
Red Hat Product Errata RHSA-2026:1413 0 None None None 2026-01-27 17:06:28 UTC
Red Hat Product Errata RHSA-2026:1414 0 None None None 2026-01-27 17:22:10 UTC
Red Hat Product Errata RHSA-2026:1415 0 None None None 2026-01-27 17:12:11 UTC
Red Hat Product Errata RHSA-2026:1461 0 None None None 2026-01-28 04:05:13 UTC
Red Hat Product Errata RHSA-2026:1462 0 None None None 2026-01-28 04:17:53 UTC
Red Hat Product Errata RHSA-2026:1471 0 None None None 2026-01-28 08:29:20 UTC
Red Hat Product Errata RHSA-2026:1487 0 None None None 2026-01-28 14:58:55 UTC
Red Hat Product Errata RHSA-2026:2041 0 None None None 2026-02-05 08:41:09 UTC
Red Hat Product Errata RHSA-2026:2043 0 None None None 2026-02-05 09:36:53 UTC
Red Hat Product Errata RHSA-2026:2044 0 None None None 2026-02-05 09:10:48 UTC
Red Hat Product Errata RHSA-2026:2047 0 None None None 2026-02-05 09:27:13 UTC
Red Hat Product Errata RHSA-2026:2069 0 None None None 2026-02-05 10:34:59 UTC
Red Hat Product Errata RHSA-2026:2070 0 None None None 2026-02-05 10:40:35 UTC
Red Hat Product Errata RHSA-2026:2073 0 None None None 2026-02-05 10:47:21 UTC
Red Hat Product Errata RHSA-2026:2074 0 None None None 2026-02-05 10:50:48 UTC
Red Hat Product Errata RHSA-2026:2220 0 None None None 2026-02-09 03:01:19 UTC
Red Hat Product Errata RHSA-2026:2231 0 None None None 2026-02-09 02:00:48 UTC
Red Hat Product Errata RHSA-2026:2271 0 None None None 2026-02-09 07:29:55 UTC
Red Hat Product Errata RHSA-2026:2286 0 None None None 2026-02-09 09:26:36 UTC

Description OSIDB Bzimport 2026-01-13 14:01:50 UTC 
Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
Comment 1 errata-xmlrpc 2026-01-15 08:19:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:0667 https://access.redhat.com/errata/RHSA-2026:0667
Comment 2 errata-xmlrpc 2026-01-15 11:47:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:0694 https://access.redhat.com/errata/RHSA-2026:0694
Comment 3 errata-xmlrpc 2026-01-21 11:56:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:0924 https://access.redhat.com/errata/RHSA-2026:0924
Comment 4 errata-xmlrpc 2026-01-27 06:51:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:1320 https://access.redhat.com/errata/RHSA-2026:1320
Comment 5 errata-xmlrpc 2026-01-27 17:06:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:1413 https://access.redhat.com/errata/RHSA-2026:1413
Comment 6 errata-xmlrpc 2026-01-27 17:12:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:1415 https://access.redhat.com/errata/RHSA-2026:1415
Comment 7 errata-xmlrpc 2026-01-27 17:22:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:1414 https://access.redhat.com/errata/RHSA-2026:1414
Comment 8 errata-xmlrpc 2026-01-28 04:05:12 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-2026:1461 https://access.redhat.com/errata/RHSA-2026:1461
Comment 9 errata-xmlrpc 2026-01-28 04:17:52 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-2026:1462 https://access.redhat.com/errata/RHSA-2026:1462
Comment 10 errata-xmlrpc 2026-01-28 08:29:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:1471 https://access.redhat.com/errata/RHSA-2026:1471
Comment 11 errata-xmlrpc 2026-01-28 14:58:54 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 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:1487 https://access.redhat.com/errata/RHSA-2026:1487
Comment 12 errata-xmlrpc 2026-02-05 08:41:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:2041 https://access.redhat.com/errata/RHSA-2026:2041
Comment 13 errata-xmlrpc 2026-02-05 09:10:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:2044 https://access.redhat.com/errata/RHSA-2026:2044
Comment 14 errata-xmlrpc 2026-02-05 09:27:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:2047 https://access.redhat.com/errata/RHSA-2026:2047
Comment 15 errata-xmlrpc 2026-02-05 09:36:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:2043 https://access.redhat.com/errata/RHSA-2026:2043
Comment 16 errata-xmlrpc 2026-02-05 10:34:58 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-2026:2069 https://access.redhat.com/errata/RHSA-2026:2069
Comment 17 errata-xmlrpc 2026-02-05 10:40:34 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 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:2070 https://access.redhat.com/errata/RHSA-2026:2070
Comment 18 errata-xmlrpc 2026-02-05 10:47:19 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-2026:2073 https://access.redhat.com/errata/RHSA-2026:2073
Comment 19 errata-xmlrpc 2026-02-05 10:50:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:2074 https://access.redhat.com/errata/RHSA-2026:2074
Comment 20 errata-xmlrpc 2026-02-09 02:00:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:2231 https://access.redhat.com/errata/RHSA-2026:2231
Comment 21 errata-xmlrpc 2026-02-09 03:01:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2220 https://access.redhat.com/errata/RHSA-2026:2220
Comment 22 errata-xmlrpc 2026-02-09 07:29:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support
  Red Hat Enterprise Linux 10

Via RHSA-2026:2271 https://access.redhat.com/errata/RHSA-2026:2271
Comment 23 errata-xmlrpc 2026-02-09 09:26:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support
  Red Hat Enterprise Linux 10

Via RHSA-2026:2286 https://access.redhat.com/errata/RHSA-2026:2286
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