Security researchers allege Ledger was notified of tampered hardware wallet devices months before issuing public warnings. Former Mt.Gox CEO Mark Karpelès stated that at least two individuals reported compromised devices to the company as early as December 2025, raising questions about the timeliness of customer notifications. Hardware security researcher Joe Grand confirmed he reported a Ledger Nano X containing a malicious hardware implant on March 4, 2026. Ledger acknowledged Grand's findings and initiated an internal investigation but has declined further comment on its handling of the report, directing inquiries to its official statement on X. Both researchers have publicly questioned whether the company failed to adequately warn customers in a timely manner regarding the security vulnerabilities.