Buffer overflow in Mozilla Firefox
CVE-2026-12329
Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Mozilla Firefox — versions 140.12
- Mozilla Thunderbird — versions 140.12
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-12329?
- CVE-2026-12329 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-06-16.
- How severe is CVE-2026-12329?
- Medium severity. CVSS v3 base score is 5.3 out of 10.