Buffer overflow in Mozilla Firefox
CVE-2026-12326
Memory safety bugs present in Firefox 151 and Thunderbird 151. 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…
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Mozilla Firefox — versions 152
- Mozilla Thunderbird — versions 152
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-12326?
- CVE-2026-12326 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-06-16.
- How severe is CVE-2026-12326?
- High severity. CVSS v3 base score is 7.3 out of 10.