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CVE-2026-4726

HIGH CVSS 3.1: 7.5 EPSS 0.01%
Updated Mar 25, 2026
Firefox
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions before 149.0
Fixed In 149.0
Type CWE-400 (Uncontrolled Resource Consumption)
Vendor Firefox
Public PoC No

Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.

Attack Parameters

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

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Mozilla Firefox
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
149.0
Mozilla Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
149.0