CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 7.4. See the original NVD description below for full technical details.
CVE
CVE-2026-4371
Severity
HIGH
CVSS
7.4
EPSS
0.36%
Original NVD Description
A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
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