CVE-2026-12327
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk13th percentile — higher than 13% of all known CVEs
Summary
Memory safety bugs exist in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. Some of these bugs showed evidence of memory corruption, which could potentially be exploited to run arbitrary code.
Risk Assessment
Organizations may be at risk of attacks that exploit these bugs to execute malicious code, potentially leading to data loss or system compromise.
Recommendation
It is recommended to update to Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12 to mitigate this vulnerability.
Original NVD description (English source)
Memory safety bugs present in 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, Thunderbird 152, and Thunderbird 140.12.