CVE-2026-2776

CriticalCVSS 10.0/10Last modified Jul 15, 2026

Description

Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-119

Affected software

No affected versions have been published.

Timeline

Published
Feb 24, 2026
Last modified
Jul 15, 2026
NVD status
Modified

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CVE-2026-2776: Critical severity, CVSS 10.0 | Vulnix