CVE-2026-5735: Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough…

critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

Memory safety bugs present in 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 and Thunderbird 149.0.2.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
debian	firefox	< firefox 149.0.2-1 (sid)	firefox 149.0.2-1 (sid)
mozilla	firefox	< 149.0.2	149.0.2
mozilla	firefox	—	—
mozilla	thunderbird	< 149.0.2	149.0.2