CVE-2026-12326
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk16th percentile — higher than 16% of all known CVEs
Summary
Memory safety bugs were found in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption, which could potentially allow arbitrary code execution. The vulnerabilities were fixed in Firefox 152 and Thunderbird 152.
Risk Assessment
An attacker could exploit these vulnerabilities to execute arbitrary code remotely on the victim's system, leading to application takeover and potentially full system compromise.
Recommendation
Immediately update Firefox to version 152 or later and Thunderbird to version 152 or later.
Original NVD description (English source)
Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 152 and Thunderbird 152.