CVE-2026-5735
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk17th percentile — higher than 17% of all known CVEs
Summary
Memory safety bugs were found in Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption, which could potentially be exploited to execute arbitrary code. The vulnerability was fixed in versions 149.0.2.
Risk Assessment
An attacker could exploit this vulnerability to remotely execute code on the victim's system, leading to application takeover and potentially full system compromise.
Recommendation
Immediately update Firefox and Thunderbird to version 149.0.2 or later.
Original NVD description (English source)
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.