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 and could potentially be exploited to run arbitrary code. The vulnerability was fixed in versions 149.0.2.
Risk Assessment
An attacker could exploit this vulnerability to execute arbitrary code remotely on the victim's system, leading to full compromise of data confidentiality, integrity, and availability.
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.