CVE-2026-12307

MEDIUM

Mozilla Firefox - Memory Safety Bug Fixed in Thunderbird 152

Title source: rule

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Core 5

Core References

CVSS v3 5.3

EPSS 0.0026

EPSS Percentile 17.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

CWE

CWE-119

Status published

Products (8)

mozilla/firefox < 140.12.0

mozilla/firefox < 152.0.0

Mozilla/Firefox 140.12 - 140.*

Mozilla/Firefox 152

mozilla/thunderbird < 140.12.0

mozilla/thunderbird < 152.0.0

Mozilla/Thunderbird 140.12 - 140.*

Mozilla/Thunderbird 152

Published Jun 16, 2026

Tracked Since Jun 16, 2026