CVE-2026-4727

HIGH

Denial-of-service in the Libraries component in NSS

Title source: cna

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

CVSS v3 7.5

EPSS 0.0002

EPSS Percentile 4.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

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