CVE-2026-2799

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

0.32%

24th percentile - higher than 24% of all known CVEs

Summary

A use-after-free vulnerability was found in the DOM: Core & HTML component of Firefox and Thunderbird. The flaw was fixed in version 148 of both applications.

Risk Assessment

An attacker could exploit this vulnerability to execute arbitrary code or cause a denial of service, compromising system confidentiality and availability.

Recommendation

Immediately update Firefox and Thunderbird to version 148 or later to mitigate the risk.

Original NVD description (English source)

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.