cbcvebase.
CVE-2026-6754
published 2026-04-21

CVE-2026-6754: Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and…

high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Affected

11 ranges
VendorProductVersion rangeFixed in
mozillafirefox< Firefox 150Firefox 150
mozillafirefox< 115.35.0115.35.0
mozillafirefox< 150.0150.0
mozillafirefox——
mozillafirefox>= 140.0 < 140.10.0140.10.0
mozillafirefox_esr< Firefox ESR 115.35Firefox ESR 115.35
mozillafirefox_esr< Firefox ESR 140.10Firefox ESR 140.10
mozillathunderbird< Thunderbird 150Thunderbird 150
mozillathunderbird< Thunderbird 140.10Thunderbird 140.10
mozillathunderbird< 140.10.0140.10.0
rhel10firefox-flatpak——