CVE-2026-2799

CRITICAL

Firefox < 148.0 - Use-After-Free in DOM Core & HTML Component

Title source: llm

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Core 3

Core References

Issue Tracking

Vendor Advisory

Vendor Advisory

CVSS v3 9.8

EPSS 0.0002

EPSS Percentile 5.4%

Attack Vector NETWORK

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

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

CWE

CWE-416

Status published

Products (4)

mozilla/firefox < 148.0

Mozilla/Firefox 148

mozilla/thunderbird < 148.0

Mozilla/Thunderbird 148

Published Feb 24, 2026

Tracked Since Feb 24, 2026