What is CVE-2026-12324?

CVE-2026-12324 is a high-severity vulnerability in Mozilla Firefox, classified under CWE-703. CVSS score: 7.3/10. Published 2026-06-16.

How severe is CVE-2026-12324?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Mozilla Firefox

CVE-2026-12324

Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

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 140.12, 152
Mozilla Thunderbird — versions 140.12, 152

Weakness classification (CWE)

CWE-703

References

security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org

Frequently asked questions

What is CVE-2026-12324?: CVE-2026-12324 is a high-severity vulnerability in Mozilla Firefox, classified under CWE-703. CVSS score: 7.3/10. Published 2026-06-16.
How severe is CVE-2026-12324?: High severity. CVSS v3 base score is 7.3 out of 10.