CVE-2026-2797

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.8 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H                                    

Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.

Published Date

February 24, 2026

Last Modified

February 26, 2026

CWE ID

CWE-416

Source

NVD

Vendor

mozilla

Product

firefox