NetSight
IP …
critical9.8

CVE-2026-2793

Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147.

Impact

Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Affected products

VendorProductAffected versions
MozillaFirefox
before 115.33.0
before 148.0
from 128.0 before 140.8.0
MozillaThunderbird
before 140.8.0
before 148.0

Weakness classification

CWE-787

References