VDB
CVE-2026-74989
CVE-2026-74989
PUBLISHED
CVSS 9.8 CRITICAL
Reported by mozilla · Published August 18, 2026
Internally found bugs present in Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Thunderbird 154.
Risk Scores
CVSS 3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 154 |
| Mozilla | Thunderbird | 154 |
| wolfi | firefox | 0, 0, 0 |
| Mozilla | Firefox | 154, 154, 154 |
| Mozilla | Thunderbird | 154, 154, 154 |
| chainguard | firefox | 0, 0, 0 |
Timeline
- Aug 18, 2026 Coalition ESS Score
- Aug 18, 2026 CVE Published
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 4, 2026 EPSS Score
- Sep 5, 2026 Security Advisory
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 24, 2026 EPSS Score