CVE-2026-84640
High · 7.5CVSS
7.5
EPSS
0.3%
Published
Sep 1, 2026
CISA due date
—
The record
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, Thunderbird 140.15, and Thunderbird 153.2.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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