Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-84641

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.6%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-84641


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