Is CVE-2026-84144 being exploited?

No public exploit is currently tracked.

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CVE-2026-84144

Description

Internally found bugs present in Firefox 154 and Firefox ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.