CVE-2026-2764

CriticalCVSS 9.8

Published: 24/02/2026(UTC)Updated: 30/06/2026(UTC)Translated: 01/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.47%

37th percentile - higher than 37% of all known CVEs

Summary

A JIT miscompilation leading to use-after-free was discovered in the JavaScript Engine component of Firefox and Thunderbird. This vulnerability was 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 achieve remote code execution or cause application crashes, compromising user data confidentiality and integrity.

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)

JIT miscompilation, use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.