CVE-2026-84641
High · 7.5CVSS
7.5
EPSS
0.3%
Published
Sep 1, 2026
CISA due date
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The record
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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Related vulnerabilities
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