CVE-2026-84125

MediumCVSS 5.4/10Last modified Sep 2, 2026

Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
MozillaFirefox—
MozillaThunderbird—

References

Timeline

Published
Sep 1, 2026
Last modified
Sep 2, 2026
NVD status
Analyzed

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CVE-2026-84125: Medium severity, CVSS 5.4 | Vulnix