by Kastro CVE-2026-2758
Mozilla Firefox — Use-after-free in the JavaScript: GC component
Description · from the CVE record
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Affected
ProductAffectedFixed inSource
Firefoxsee advisory115.33CNA
Thunderbirdsee advisory140.8CNA
Red Hat Enterprise Linux 10see advisory0:140.8.0-2.el10_1redhat-SADP
Red Hat Enterprise Linux 10see advisory0:140.8.0-2.el10_1redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.8.0-2.el10_0redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.8.0-2.el10_0redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:140.8.0-2.el7_9redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.8.0-2.el8_10redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.8.0-1.el8_10redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory0:140.8.0-2.el8_2redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory0:140.8.0-1.el8_2redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:140.8.0-2.el8_4redhat-SADP
Scores by source
CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADP (CNA)7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total