CVE-2026-7323

Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1

High · published April 28, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
38.7
In the wild
Unconfirmed
What it is

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00458 · 38.7th percentile
Published
2026-04-28T13:49Z
EPSS history
Timeline
  • 28 APR 13:49Z
    Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1
    cvelistv5