CVE-2026-2778

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

Mozilla Buffer Overflow Memory Corruption Privilege Escalation RCE Thunderbird Firefox Redhat Suse

Description

Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Analysis

Sandbox escape via DOM Core & HTML component in Firefox before 148. CVSS 10.0 — fifth sandbox escape in this release.

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Remediation

Within 24 hours: Identify and inventory all systems running Firefox <148, Firefox ESR <115.33, <140.8, Thunderbird <148, or <140.8 through endpoint detection tools; issue security alert to all users. Within 7 days: Implement network-based browser isolation or sandboxing solutions for high-risk users; disable JavaScript execution in email clients where possible; establish daily vulnerability monitoring for patch availability. …

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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-2026-2778 vulnerability details – vuln.today
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