CVE-2026-2767

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

0.38%

30th percentile - higher than 30% of all known CVEs

Summary

A use-after-free vulnerability was found in the JavaScript: WebAssembly component, 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 or cause a denial of service, posing a serious risk to 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: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.