by Kastro CVE-2026-4689
Mozilla Firefox — Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
Description · from the CVE record
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Affected
ProductAffectedFixed inSource
Firefoxsee advisory115.34CNA
Thunderbirdsee advisory140.9CNA
Red Hat Enterprise Linux 10see advisory0:140.9.0-1.el10_1redhat-SADP
Red Hat Enterprise Linux 10see advisory0:140.9.0-1.el10_1redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.9.0-1.el10_0redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.9.0-1.el10_0redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:140.9.0-1.el7_9redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.9.0-1.el8_10redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.9.0-1.el8_10redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory0:140.9.0-1.el8_2redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory0:140.9.0-1.el8_2redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:140.9.0-1.el8_4redhat-SADP
Scores by source
CISA ADP10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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