high7.5
CVE-2026-84641
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mozilla | Thunderbird | before 140.15.0 from 141.0 before 153.2.0 from 154.0 before 155.0 |