CVE-2026-6746highCWE-416CWE-825

CVE-2026-6746: high-severity vulnerability in Mozilla Firefox

Use-after-free in the DOM: Core & HTML component

Published · Updated

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21Vexday Risk Score

No sign of exploitation. It has an official Brazilian government alert.

ssvc Trackcvss 7.5epss 0.9%
Official alert in Brazil

Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.

  • CTIR Gov · RECOMENDAÇÃO 08/2026Recomendações de Segurança Cibernética – Atualização para a versão 150 do Mozila Firefoxread on gov.br ↗
Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Mozilla · FirefoxMozilla · Thunderbird
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