VULNERABILITY INTELLIGENCE

CVE-2026-84641

CVSS score7.5 HIGH
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-09-01
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-416

Primary references