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Firefox · Core

CVE-2026-84142

Logic Error in Core
Moderate firefox Logic Error

Overview

Moderate
Severity
—
CVSS
No
Exploited ITW
Embargoed
Fix Status
Impactmoderate
DescriptionInternally found bugs present in Firefox 154. 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.
ComponentCore
Bug ClassLogic Error
Tracker2029421
CISA KEVNot listed
CreditedAlexandre Poirot, Christian Holler, Sebastian Hengst and the Mozilla Fuzzing Team
Disclosed2026-09-01

Fix not yet public

No public source fix for this bug has been identified on the main branch yet — it is embargoed or not yet disclosed. Root-cause analysis is withheld until the fix commit is available.
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