CVE-2026-8974
Public on 2026-05-19
Modified on 2026-05-20
Description
Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Firefox Extra | firefox | 2026-06-08 | ALAS2FIREFOX-2026-061 | Fixed |
| Amazon Linux 2023 | firefox | 2026-06-08 | ALAS2023-2026-1793 | Fixed |
| Amazon Linux 2 - Core | thunderbird | 2026-06-08 | ALAS2-2026-3340 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |