CVE-2026-113869CWE-416

CVE-2026-113869

Medium · published October 21, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
19.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00278 · 19.2th percentile
Weakness
CWE-416 · Use After Free
Published
2026-10-21T00:17Z
References (2)
https://bugzilla.mozilla.org/show_bug.cgi?id=2075530 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-114/ · [email protected]
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 19:14Z
    Use-after-free in S/MIME decryption during a security device password prompt
    cvelistv5
  • 20 OCT 19:14Z
    Use-after-free in S/MIME decryption during a security device password prompt
    cvelistv5