CVE-2026-2760

CriticalCVSS 10.0

Published: 24/02/2026(UTC)Updated: 15/07/2026(UTC)Translated: 16/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.40%

32th percentile - higher than 32% of all known CVEs

Summary

A sandbox escape vulnerability exists in the WebRender component of Firefox and Thunderbird due to incorrect boundary conditions in graphics handling. The flaw is fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Risk Assessment

An attacker can exploit this vulnerability to break out of the sandbox, potentially leading to arbitrary code execution in the user's context and full system compromise.

Recommendation

Immediately update Firefox to version 148 or later (or the appropriate ESR version) and Thunderbird to version 148 or 140.8.

Original NVD description (English source)

Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.