VDB
CVE-2026-84641
CVE-2026-84641
PUBLISHED
CVSS 7.5 HIGH
Reported by mozilla · Published September 1, 2026
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | 140.15, 153.2, 155 |
| Mozilla | Thunderbird | 140.15, 153.2, 155 |
Timeline
- Sep 1, 2026 CVE Published
- Sep 2, 2026 EPSS Score
- Sep 2, 2026 Coalition ESS Score
- Sep 2, 2026 CVE Updated
- Sep 3, 2026 EPSS Score
- Sep 4, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score