CVE-2026-2765

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 component of Firefox and Thunderbird. It 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 application crashes, posing a serious risk to system confidentiality and availability.

Recommendation

Immediately update Firefox to version 148 or later, and Thunderbird to version 148 or 140.8 depending on the ESR branch used.

Original NVD description (English source)

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