CVE-2026-4729

CriticalCVSS 9.8/10Last modified Jul 15, 2026

Description

Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-120CWE-825

Affected software

No affected versions have been published.

Timeline

Published
Mar 24, 2026
Last modified
Jul 15, 2026
NVD status
Modified

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CVE-2026-4729: Critical severity, CVSS 9.8 | Vulnix