Bug 2527113 (CVE-2026-84639) - CVE-2026-84639 thunderbird: Uninitialized memory in MIME parsing
Summary: CVE-2026-84639 thunderbird: Uninitialized memory in MIME parsing
Keywords:
Status: NEW
Alias: CVE-2026-84639
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: 2026-09-01 21:41 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-2026:70642 0 None None None 2026-09-24 01:58:10 UTC
Red Hat Product Errata RHSA-2026:73130 0 None None None 2026-09-29 12:15:31 UTC
Red Hat Product Errata RHSA-2026:73971 0 None None None 2026-09-30 14:19:29 UTC
Red Hat Product Errata RHSA-2026:77627 0 None None None 2026-10-07 16:04:21 UTC
Red Hat Product Errata RHSA-2026:77631 0 None None None 2026-10-07 15:21:35 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 05:00:46 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 21:41:53 UTC 
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155.
Comment 1 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 2 Jon Orris 2026-09-29 12:15:29 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 3 Jon Orris 2026-09-30 14:19:28 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 4 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 5 Jon Orris 2026-10-07 15:21:34 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 6 Jon Orris 2026-10-07 16:04:20 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 7 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 9 Jon Orris 2026-10-13 04:59:00 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 10 Jon Orris 2026-10-13 05:00:45 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 11 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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