CVE-2026-2776

CRITICAL
2026-02-24 [email protected]
10.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch Released
Apr 10, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 10.0

Tags

Buffer Overflow Memory Corruption Privilege Escalation Firefox Thunderbird Redhat Suse

Description

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

Analysis

Sandbox escape via Telemetry component in Firefox external software before 148. CVSS 10.0 — fourth sandbox escape in this release, through the telemetry subsystem.

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Remediation

Within 24 hours: Inventory all Firefox and Thunderbird installations across the organization and disable Telemetry features via group policy or configuration management. Within 7 days: Issue security alert to all users advising against using affected versions for sensitive activities and provide alternative browsers (Chrome, Edge) for critical work. …

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Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +50
POC: 0

Vendor Status

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CVE-2026-2776 vulnerability details – vuln.today
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