CVE-2026-12329

Memory safety bug fixed in Thunderbird ESR 140.12

Medium · published June 16, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
23.0
In the wild
Unconfirmed
What it is

Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00313 · 23.0th percentile
Published
2026-06-16T11:53Z
EPSS history
Timeline
  • 16 JUN 11:53Z
    Memory safety bug fixed in Thunderbird ESR 140.12
    cvelistv5