CVE-2026-2799
CRITICALCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
Use-after-free in the DOM: Core & HTML component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Analysis
Use-after-free in Firefox DOM Core & HTML before 148. DOM object lifecycle error.
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Remediation
Within 24 hours: Identify and inventory all Firefox and Thunderbird installations across the enterprise; communicate vulnerability status to end-users; restrict access to untrusted websites and email content where possible. Within 7 days: Implement browser isolation solutions for high-risk users; disable JavaScript in Thunderbird if operationally feasible; monitor for exploitation indicators and suspicious process behavior. …
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External POC / Exploit Code
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