CVE-2026-84639
thunderbird: Uninitialized memory in MIME parsing
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 2, 2026
Updated · October 13, 2026
Description
A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-824 · Access of Uninitialized Pointer