CVE-2026-2758

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

0.48%

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

Summary

A use-after-free vulnerability was found in the JavaScript: GC 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 flaw to execute arbitrary code or cause a crash, compromising data confidentiality and integrity.

Recommendation

Immediately update Firefox and Thunderbird to the patched versions listed (Firefox 148, ESR 115.33/140.8, Thunderbird 148/140.8).

Original NVD description (English source)

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.