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.
CVSS Details
- CVSS 3.1 Base Score: 7.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbird | Apr 3, 2026 | Mar 30, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade thunderbird | Mar 30, 2026 | Mar 30, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.9 | Mar 27, 2026 | Mar 24, 2026 |
| Oracle_linux | — | Upgrade thunderbird | Apr 1, 2026 | Mar 24, 2026 |
| Redhat_linux | — | No solution existsUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade thunderbird-debugsource | Mar 31, 2026 | Mar 24, 2026 |
| Rocky_linux | — | Upgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbird | Apr 8, 2026 | Apr 7, 2026 |
| Suse | — | Upgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-openpgp-librnp | Apr 2, 2026 | Apr 1, 2026 |
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