What is CVE-2026-109773?

CVE-2026-109773 is a medium-severity vulnerability, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-13.

How severe is CVE-2026-109773?

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

CVE-2026-109773

Denial-of-service in the Sync component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Published 2026-10-13 · last modified 2026-10-13.

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.

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

What is CVE-2026-109773?: CVE-2026-109773 is a medium-severity vulnerability, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-13.
How severe is CVE-2026-109773?: Medium severity. CVSS v3 base score is 6.5 out of 10.