CVE-2026-113869
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductThunderbird
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- Thunderbird158.0.1, 153.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird | No range specified | 158.0.1, 153.6 |
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