PT-2026-84525
CVE-2026-84639
·
Published
2026-09-01
·
Updated
2026-09-30
Description by
CVSS 3.1
9.1
CriticalMetricsAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Name of the Vulnerable Software and Affected Versions
Thunderbird versions prior to 140.15
Thunderbird versions prior to 153.2
Thunderbird versions prior to 155
Description
Triggering an error condition in certain MIME bodies (Multipurpose Internet Mail Extensions, a standard that allows email to support non-text attachments) causes the use of uninitialized memory.
Recommendations
Update to version 140.15.
Update to version 153.2.
Update to version 155.
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