๐Ÿ›ก๏ธ CVE-2026-4371
๐ŸŸ  CVSS 7.4 โ€” High โœ… No Known Exploit CWE-126 NVD
7.4
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 7.4
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE CWE-126
Public Exploit โœ… No
Source NVD
Published 2026-03-24
Updated 2026-06-02
Modified 2026-04-13
Fix URL N/A

Affected Packages

Software From version Fixed in
thunderbird โ€” 149.0

Similar Threats

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