CVE-2026-74973

CVE-2026-74973

Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-74973?
CVE-2026-74973 is a medium-severity vulnerability, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.2/10. Published 2026-08-18.
How severe is CVE-2026-74973?
Medium severity. CVSS v3 base score is 4.2 out of 10.