What is CVE-2026-109748?

CVE-2026-109748 is a medium-severity vulnerability, classified under Use After Free. CVSS score: 5.4/10. Published 2026-10-13.

How severe is CVE-2026-109748?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CVE-2026-109748

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Vulnerability class: Use-After-Free

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

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

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-2026-109748?: CVE-2026-109748 is a medium-severity vulnerability, classified under Use After Free. CVSS score: 5.4/10. Published 2026-10-13.
How severe is CVE-2026-109748?: Medium severity. CVSS v3 base score is 5.4 out of 10.