Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-84639

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 27.2%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-84639


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