CVE-2026-113869
Use-after-free in S/MIME decryption during a security device password prompt
- State
- Published
- Severity
- 5.4 Medium
- Published
- Oct 20, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 20, 2026
Description
When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message load could finish or be cancelled while the prompt was open. This freed the message decoder while it was still in use, causing a use-after-free and a potentially exploitable crash. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.6.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L | CISA-ADP |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
ThunderbirdMozilla |
|
References
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