Bug 2527113 (CVE-2026-84639)

Summary:	CVE-2026-84639 thunderbird: Uninitialized memory in MIME parsing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	gotiwari, jhorak, mvyas, rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

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