CVE-2026-2766

CriticalCVSS 9.8

Published: 24/02/2026(UTC)Updated: 15/07/2026(UTC)Translated: 16/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.47%

38th percentile - higher than 38% of all known CVEs

Summary

A use-after-free vulnerability was found in the JavaScript Engine: JIT component. The flaw was fixed in Firefox 148, 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 data confidentiality and integrity.

Recommendation

Immediately update Firefox to version 148 or later and Thunderbird to version 148 or 140.8.

Original NVD description (English source)

Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.