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36impact

Use-after-free in S/MIME decryption during a security device password prompt

Mozilla Firefox · CVE-2026-113869
0 news outlets2 CERTs and agencies0 researchers

What is it?

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.

Evidence

CERTs and agencies (2)

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.4
EPSS
0.3%
First seen
2 d ago
Status
confirmed

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