Bug 2527116 (CVE-2026-84640) - CVE-2026-84640 thunderbird: One byte overflow read in mail parser
Summary: CVE-2026-84640 thunderbird: One byte overflow read in mail parser
Keywords:
Status: NEW
Alias: CVE-2026-84640
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-01 21:43 UTC by OSIDB Bzimport
Modified: 2026-09-29 12:15 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 01:58:46 UTC
Red Hat Product Errata RHSA-2026:73130 0 None None None 2026-09-29 12:15:32 UTC

Description OSIDB Bzimport 2026-09-01 21:43:38 UTC 
A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155.
Comment 1 Jon Orris 2026-09-24 01:58:43 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 2026-09-24 01:58:45 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 3 Jon Orris 2026-09-29 12:15:31 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
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