by Kastro CVE-2026-5734
Mozilla Firefox — Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
Description · from the CVE record
Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
Affected
ProductAffectedFixed inSource
Firefoxsee advisory140.9.1CNA
Thunderbirdsee advisory140.9.1CNA
Red Hat Enterprise Linux 10see advisory0:140.9.1-1.el10_1redhat-SADP
Red Hat Enterprise Linux 10see advisory0:140.9.1-1.el10_1redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.9.1-1.el10_0redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:140.9.1-1.el10_0redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:140.9.1-2.el7_9redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.9.1-1.el8_10redhat-SADP
Red Hat Enterprise Linux 8see advisory0:140.9.1-1.el8_10redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory0:140.9.1-1.el8_2redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:140.9.1-1.el8_4redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:140.9.1-1.el8_4redhat-SADP
Scores by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADP (CNA)8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADP8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total