CVE-2026-84639
Critical · 9.1CVSS
9.1
EPSS
0.3%
Published
Sep 1, 2026
CISA due date
—
The record
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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