Is CVE-2026-113869 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-113869?

CVE-2026-113869 has a CVSS v3 severity of MEDIUM (5.4).

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CVE-2026-113869

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.