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CVE-2026-3847

HIGH CVSS 3.1: 8.8 EPSS 0.05%
Updated Mar 10, 2026
Firefox
Parameter Value
CVSS 8.8 (HIGH)
Type CWE-119 (Buffer Overflow), CWE-416 (Use After Free)
Vendor Firefox
Public PoC No

Memory safety bugs present in Firefox 148.0.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 148.0.2.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1