The answer
It can be. In an air-gapped signing workflow, the offline device signs transaction data transferred via QR codes without directly connecting its private-key environment to a network.
What to do next
Confirm the wallet signs only on the offline device and review destination address and amount on its own screen. QR codes are a data channel, not proof that all software is trustworthy.
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Trezor hardware wallet
Related self-custody hardware; verify supported coins, networks and recovery standards. It cannot reverse an already compromised seed or fraudulent transfer.
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Frequently asked questions
Can a QR code steal keys from an air-gapped hardware wallet?
Ordinary unsigned transaction transfer should not reveal keys, but malicious firmware or signing mistakes remain risks.