CVE-2026-84142
Critical · 9.8CVSS
9.8
EPSS
0.6%
Published
Sep 1, 2026
CISA due date
—
The record
Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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