What is CVE-2026-12319?

CVE-2026-12319 is a medium-severity vulnerability in Mozilla Firefox, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-06-16.

How severe is CVE-2026-12319?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Mozilla Firefox

CVE-2026-12319

Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Mozilla Firefox — versions 152
Mozilla Thunderbird — versions 152

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

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

Frequently asked questions

What is CVE-2026-12319?: CVE-2026-12319 is a medium-severity vulnerability in Mozilla Firefox, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-06-16.
How severe is CVE-2026-12319?: Medium severity. CVSS v3 base score is 6.5 out of 10.