Bug 2455897 (CVE-2026-5734) - CVE-2026-5734 thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
Summary: CVE-2026-5734 thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 1...
Keywords:
Status: NEW
Alias: CVE-2026-5734
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: 2026-04-07 13:01 UTC by OSIDB Bzimport
Modified: 2026-05-11 01:32 UTC (History)
7 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-2026:11805 0 None None None 2026-04-29 15:42:42 UTC
Red Hat Product Errata RHSA-2026:11813 0 None None None 2026-04-29 16:09:01 UTC
Red Hat Product Errata RHSA-2026:12264 0 None None None 2026-04-30 11:49:06 UTC
Red Hat Product Errata RHSA-2026:13342 0 None None None 2026-05-04 06:02:55 UTC
Red Hat Product Errata RHSA-2026:13412 0 None None None 2026-05-04 12:04:23 UTC
Red Hat Product Errata RHSA-2026:13533 0 None None None 2026-05-04 15:51:38 UTC
Red Hat Product Errata RHSA-2026:13582 0 None None None 2026-05-05 06:32:52 UTC
Red Hat Product Errata RHSA-2026:13583 0 None None None 2026-05-05 06:38:49 UTC
Red Hat Product Errata RHSA-2026:13596 0 None None None 2026-05-05 06:30:28 UTC
Red Hat Product Errata RHSA-2026:13600 0 None None None 2026-05-05 06:48:44 UTC
Red Hat Product Errata RHSA-2026:13665 0 None None None 2026-05-05 09:25:54 UTC
Red Hat Product Errata RHSA-2026:13682 0 None None None 2026-05-05 10:14:44 UTC
Red Hat Product Errata RHSA-2026:13683 0 None None None 2026-05-05 10:20:56 UTC
Red Hat Product Errata RHSA-2026:13922 0 None None None 2026-05-06 07:07:26 UTC
Red Hat Product Errata RHSA-2026:13977 0 None None None 2026-05-06 11:36:11 UTC
Red Hat Product Errata RHSA-2026:14223 0 None None None 2026-05-06 16:54:55 UTC
Red Hat Product Errata RHSA-2026:14303 0 None None None 2026-05-06 19:18:01 UTC
Red Hat Product Errata RHSA-2026:15889 0 None None None 2026-05-11 01:32:57 UTC
Red Hat Product Errata RHSA-2026:7671 0 None None None 2026-04-13 02:23:52 UTC
Red Hat Product Errata RHSA-2026:7672 0 None None None 2026-04-13 02:19:48 UTC
Red Hat Product Errata RHSA-2026:8052 0 None None None 2026-04-14 11:32:50 UTC
Red Hat Product Errata RHSA-2026:8459 0 None None None 2026-04-16 12:51:33 UTC
Red Hat Product Errata RHSA-2026:9345 0 None None None 2026-04-21 15:02:23 UTC
Red Hat Product Errata RHSA-2026:9638 0 None None None 2026-04-22 07:35:52 UTC

Description OSIDB Bzimport 2026-04-07 13:01:25 UTC 
Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 < 149.0.2 and Firefox ESR < 140.9.1.
Comment 1 errata-xmlrpc 2026-04-13 02:19:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7672 https://access.redhat.com/errata/RHSA-2026:7672
Comment 2 errata-xmlrpc 2026-04-13 02:23:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7671 https://access.redhat.com/errata/RHSA-2026:7671
Comment 3 errata-xmlrpc 2026-04-14 11:32:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:8052 https://access.redhat.com/errata/RHSA-2026:8052
Comment 4 errata-xmlrpc 2026-04-16 12:51:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:8459 https://access.redhat.com/errata/RHSA-2026:8459
Comment 5 errata-xmlrpc 2026-04-21 15:02:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:9345 https://access.redhat.com/errata/RHSA-2026:9345
Comment 6 errata-xmlrpc 2026-04-22 07:35:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:9638 https://access.redhat.com/errata/RHSA-2026:9638
Comment 7 errata-xmlrpc 2026-04-29 15:42:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:11805 https://access.redhat.com/errata/RHSA-2026:11805
Comment 8 errata-xmlrpc 2026-04-29 16:09:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:11813 https://access.redhat.com/errata/RHSA-2026:11813
Comment 9 errata-xmlrpc 2026-04-30 11:49:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:12264 https://access.redhat.com/errata/RHSA-2026:12264
Comment 10 errata-xmlrpc 2026-05-04 06:02:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:13342 https://access.redhat.com/errata/RHSA-2026:13342
Comment 11 errata-xmlrpc 2026-05-04 12:04:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13412 https://access.redhat.com/errata/RHSA-2026:13412
Comment 12 errata-xmlrpc 2026-05-04 15:51:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:13533 https://access.redhat.com/errata/RHSA-2026:13533
Comment 13 errata-xmlrpc 2026-05-05 06:30:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:13596 https://access.redhat.com/errata/RHSA-2026:13596
Comment 14 errata-xmlrpc 2026-05-05 06:32:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:13582 https://access.redhat.com/errata/RHSA-2026:13582
Comment 15 errata-xmlrpc 2026-05-05 06:38:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:13583 https://access.redhat.com/errata/RHSA-2026:13583
Comment 16 errata-xmlrpc 2026-05-05 06:48:43 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-2026:13600 https://access.redhat.com/errata/RHSA-2026:13600
Comment 17 errata-xmlrpc 2026-05-05 09:25:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:13665 https://access.redhat.com/errata/RHSA-2026:13665
Comment 18 errata-xmlrpc 2026-05-05 10:14:43 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-2026:13682 https://access.redhat.com/errata/RHSA-2026:13682
Comment 19 errata-xmlrpc 2026-05-05 10:20:55 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-2026:13683 https://access.redhat.com/errata/RHSA-2026:13683
Comment 20 errata-xmlrpc 2026-05-06 07:07:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13922 https://access.redhat.com/errata/RHSA-2026:13922
Comment 21 errata-xmlrpc 2026-05-06 11:36:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:13977 https://access.redhat.com/errata/RHSA-2026:13977
Comment 22 errata-xmlrpc 2026-05-06 16:54:53 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-2026:14223 https://access.redhat.com/errata/RHSA-2026:14223
Comment 23 errata-xmlrpc 2026-05-06 19:18:00 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-2026:14303 https://access.redhat.com/errata/RHSA-2026:14303
Comment 24 errata-xmlrpc 2026-05-11 01:32:56 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-2026:15889 https://access.redhat.com/errata/RHSA-2026:15889
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