Bug 2450751 (CVE-2026-4720) - CVE-2026-4720 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
Summary: CVE-2026-4720 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 1...
Keywords:
Status: NEW
Alias: CVE-2026-4720
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: 2026-03-24 13:03 UTC by OSIDB Bzimport
Modified: 2026-04-28 06:58 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-2026:5930 0 None None None 2026-03-26 11:32:21 UTC
Red Hat Product Errata RHSA-2026:5931 0 None None None 2026-03-26 11:21:14 UTC
Red Hat Product Errata RHSA-2026:5932 0 None None None 2026-03-26 11:32:33 UTC
Red Hat Product Errata RHSA-2026:6188 0 None None None 2026-03-30 15:59:20 UTC
Red Hat Product Errata RHSA-2026:6342 0 None None None 2026-04-01 09:37:21 UTC
Red Hat Product Errata RHSA-2026:6917 0 None None None 2026-04-07 21:30:15 UTC
Red Hat Product Errata RHSA-2026:7837 0 None None None 2026-04-13 10:51:17 UTC
Red Hat Product Errata RHSA-2026:7838 0 None None None 2026-04-13 10:34:21 UTC
Red Hat Product Errata RHSA-2026:7839 0 None None None 2026-04-13 10:02:44 UTC
Red Hat Product Errata RHSA-2026:7840 0 None None None 2026-04-13 10:02:58 UTC
Red Hat Product Errata RHSA-2026:7841 0 None None None 2026-04-13 10:12:49 UTC
Red Hat Product Errata RHSA-2026:7842 0 None None None 2026-04-13 10:13:16 UTC
Red Hat Product Errata RHSA-2026:7843 0 None None None 2026-04-13 10:21:04 UTC
Red Hat Product Errata RHSA-2026:7845 0 None None None 2026-04-13 10:44:44 UTC
Red Hat Product Errata RHSA-2026:7858 0 None None None 2026-04-13 12:46:05 UTC
Red Hat Product Errata RHSA-2026:8284 0 None None None 2026-04-15 10:47:08 UTC
Red Hat Product Errata RHSA-2026:8285 0 None None None 2026-04-15 10:30:16 UTC
Red Hat Product Errata RHSA-2026:8286 0 None None None 2026-04-15 10:44:26 UTC
Red Hat Product Errata RHSA-2026:8287 0 None None None 2026-04-15 10:38:35 UTC
Red Hat Product Errata RHSA-2026:8288 0 None None None 2026-04-15 10:39:14 UTC
Red Hat Product Errata RHSA-2026:8289 0 None None None 2026-04-15 10:44:49 UTC
Red Hat Product Errata RHSA-2026:8290 0 None None None 2026-04-15 10:50:27 UTC
Red Hat Product Errata RHSA-2026:8315 0 None None None 2026-04-15 14:04:52 UTC
Red Hat Product Errata RHSA-2026:8427 0 None None None 2026-04-16 10:16:27 UTC
Red Hat Product Errata RHSA-2026:8850 0 None None None 2026-04-20 01:27:05 UTC

Description OSIDB Bzimport 2026-03-24 13:03:53 UTC 
Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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 and Firefox ESR < 140.9.
Comment 1 errata-xmlrpc 2026-03-26 11:21:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:5931 https://access.redhat.com/errata/RHSA-2026:5931
Comment 2 errata-xmlrpc 2026-03-26 11:32:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:5930 https://access.redhat.com/errata/RHSA-2026:5930
Comment 3 errata-xmlrpc 2026-03-26 11:32:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:5932 https://access.redhat.com/errata/RHSA-2026:5932
Comment 4 errata-xmlrpc 2026-03-30 15:59:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:6188 https://access.redhat.com/errata/RHSA-2026:6188
Comment 5 errata-xmlrpc 2026-04-01 09:37:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:6342 https://access.redhat.com/errata/RHSA-2026:6342
Comment 6 errata-xmlrpc 2026-04-07 21:30:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:6917 https://access.redhat.com/errata/RHSA-2026:6917
Comment 7 errata-xmlrpc 2026-04-13 10:02:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:7839 https://access.redhat.com/errata/RHSA-2026:7839
Comment 8 errata-xmlrpc 2026-04-13 10:02:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:7840 https://access.redhat.com/errata/RHSA-2026:7840
Comment 9 errata-xmlrpc 2026-04-13 10:12:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:7841 https://access.redhat.com/errata/RHSA-2026:7841
Comment 10 errata-xmlrpc 2026-04-13 10:13:14 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-2026:7842 https://access.redhat.com/errata/RHSA-2026:7842
Comment 11 errata-xmlrpc 2026-04-13 10:21:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:7843 https://access.redhat.com/errata/RHSA-2026:7843
Comment 12 errata-xmlrpc 2026-04-13 10:34:19 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-2026:7838 https://access.redhat.com/errata/RHSA-2026:7838
Comment 13 errata-xmlrpc 2026-04-13 10:44:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:7845 https://access.redhat.com/errata/RHSA-2026:7845
Comment 14 errata-xmlrpc 2026-04-13 10:51:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:7837 https://access.redhat.com/errata/RHSA-2026:7837
Comment 15 errata-xmlrpc 2026-04-13 12:46:04 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-2026:7858 https://access.redhat.com/errata/RHSA-2026:7858
Comment 16 errata-xmlrpc 2026-04-15 10:30:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:8285 https://access.redhat.com/errata/RHSA-2026:8285
Comment 17 errata-xmlrpc 2026-04-15 10:38:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:8287 https://access.redhat.com/errata/RHSA-2026:8287
Comment 18 errata-xmlrpc 2026-04-15 10:39:13 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-2026:8288 https://access.redhat.com/errata/RHSA-2026:8288
Comment 19 errata-xmlrpc 2026-04-15 10:44:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:8286 https://access.redhat.com/errata/RHSA-2026:8286
Comment 20 errata-xmlrpc 2026-04-15 10:44:47 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-2026:8289 https://access.redhat.com/errata/RHSA-2026:8289
Comment 21 errata-xmlrpc 2026-04-15 10:47:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:8284 https://access.redhat.com/errata/RHSA-2026:8284
Comment 22 errata-xmlrpc 2026-04-15 10:50:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:8290 https://access.redhat.com/errata/RHSA-2026:8290
Comment 23 errata-xmlrpc 2026-04-15 14:04:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:8315 https://access.redhat.com/errata/RHSA-2026:8315
Comment 24 errata-xmlrpc 2026-04-16 10:16:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:8427 https://access.redhat.com/errata/RHSA-2026:8427
Comment 25 errata-xmlrpc 2026-04-20 01:27:03 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-2026:8850 https://access.redhat.com/errata/RHSA-2026:8850
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