Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-84640

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-84640


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