CVE-2026-4726

HIGH

Firefox and Thunderbird - Denial of Service in XML Component

Title source: manual
STIX 2.1

Description

Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

References (3)

Scores

CVSS v3 7.5
EPSS 0.0001
EPSS Percentile 2.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (6)
mozilla/firefox < 149.0
Mozilla/Firefox 149
Mozilla/Firefox unspecified - 149
mozilla/thunderbird < 149.0
Mozilla/Thunderbird 149
Mozilla/Thunderbird unspecified - 149
Published Mar 24, 2026
Tracked Since Mar 24, 2026