CVE-2026-2807: Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort…

critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

Memory safety bugs present in 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 and Thunderbird 148.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
debian	firefox	< firefox 148.0-1 (sid)	firefox 148.0-1 (sid)
mozilla	firefox	< 148.0	148.0
mozilla	firefox	—	—
mozilla	thunderbird	< 148.0	148.0

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

osv9.8CRITICAL