CVE-2025-6424

CriticalCVSS 9.8/10Last modified Oct 23, 2026

Description

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

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-416

Affected software

VendorProductVersions
MozillaFirefox—
MozillaThunderbird—

References

Timeline

Published
Jun 24, 2025
Last modified
Oct 23, 2026
NVD status
Modified

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CVE-2025-6424: Critical severity, CVSS 9.8 | Vulnix