CVE-2026-113869
CVE-2026-113869
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.
Vulnerability class: Use-After-Free
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-113869?
- CVE-2026-113869 is a medium-severity vulnerability, classified under Use After Free. CVSS score: 5.4/10. Published 2026-10-20.
- How severe is CVE-2026-113869?
- Medium severity. CVSS v3 base score is 5.4 out of 10.