CVE-2026-84119 is a vulnerability in Mozilla Firefox
Published on September 1, 2026
Sandbox escape due to use-after-free in the DOM: Navigation component
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.
Vulnerability Analysis
CVE-2026-84119 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-84119 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-84119
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Affected Versions
Mozilla Firefox:- Version 115.40, <= 115.* is unaffected.
- Version 140.15, <= 140.* is unaffected.
- Version 153.2, <= 153.* is unaffected.
- Version 155, <= * is unaffected.