CVE-2026-12328
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk38th percentile — higher than 38% of all known CVEs
Summary
Memory safety bugs were found in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. Some of these bugs showed evidence of memory corruption, potentially allowing arbitrary code execution. The vulnerabilities were fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Risk Assessment
An attacker could exploit these vulnerabilities to remotely execute arbitrary code on the victim's system, leading to full system compromise, data theft, or malware installation.
Recommendation
Immediately update all Firefox and Thunderbird instances to the versions specified in the description (Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, Thunderbird 140.12).
Original NVD description (English source)
Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, 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, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.