CVE-2026-2763
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
A use-after-free vulnerability was discovered in the JavaScript Engine component of Firefox and Thunderbird. It is fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Risk Assessment
An attacker could exploit this vulnerability to execute arbitrary code remotely or cause a denial of service, compromising the confidentiality and integrity of organizational data.
Recommendation
Immediately update Firefox and Thunderbird to the latest versions specified in the advisory (Firefox 148, ESR 115.33/140.8, Thunderbird 148/140.8).
Original NVD description (English source)
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.