CVE-2026-4371

Name
CVE-2026-4371
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security@mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2023493
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-23/
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-24/

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* thunderbird >= None < 140.9.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* thunderbird >= None < 149.0

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
thunderbird edge-community 148.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 145.0-r2 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 145.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 145.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 144.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 140.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 140.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 139.0.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r2 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.8.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.6.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.4.4-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.4.3-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.4.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.1.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 115.10.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 115.5.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 115.4.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 115.4.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 102.1.0-r0 psykose <alice@ayaya.dev> possibly vulnerable
thunderbird edge-community 102.0-r0 psykose <alice@ayaya.dev> possibly vulnerable
thunderbird edge-community 91.10.0-r0 psykose <alice@ayaya.dev> possibly vulnerable
thunderbird edge-community 91.9.1-r0 psykose <alice@ayaya.dev> possibly vulnerable
thunderbird edge-community 91.9.0-r0 None possibly vulnerable
thunderbird edge-community 91.8.0-r0 None possibly vulnerable
thunderbird edge-community 91.7.0-r0 None possibly vulnerable
thunderbird edge-community 91.6.2-r0 None possibly vulnerable
thunderbird edge-community 91.6.0-r0 None possibly vulnerable
thunderbird edge-community 91.5.0-r0 None possibly vulnerable
thunderbird edge-community 91.4.1-r0 None possibly vulnerable
thunderbird edge-community 91.4.0-r0 None possibly vulnerable
thunderbird edge-community 91.3.2-r0 None possibly vulnerable
thunderbird edge-community 78.9.0-r0 None possibly vulnerable
thunderbird edge-community 78.7.0-r0 None possibly vulnerable
thunderbird edge-community 78.6.1-r0 None possibly vulnerable
thunderbird edge-community 78.5.1-r0 None possibly vulnerable
thunderbird edge-community 68.10.0-r0 None possibly vulnerable
thunderbird edge-community 68.9.0-r0 None possibly vulnerable
thunderbird edge-community 68.8.0-r0 None possibly vulnerable
thunderbird edge-community 68.7.0-r0 None possibly vulnerable
thunderbird edge-community 68.6.0-r0 None possibly vulnerable
thunderbird edge-community 68.5.0-r0 None possibly vulnerable
thunderbird 3.23-community 145.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable