CVE-2026-84124 is a vulnerability in Mozilla Firefox
Published on September 1, 2026
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.
Products Associated with CVE-2026-84124
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Affected Versions
Mozilla Firefox:- Version 140.15, <= 140.* is unaffected.
- Version 153.2, <= 153.* is unaffected.
- Version 155, <= * is unaffected.