  Measurement-device-independent quantum key distribution protocol, whose
security analysis does not rely on any assumption on the detection system, can
immune the attacking against detectors. We give a first composable security
analysis for continuous-variable measurement-device-independent quantum key
distribution using squeezed states against general coherent attacks. The
security analysis is derived based on the entanglement-based scheme considering
finite size effect. A version of entropic uncertainty relation is exploited to
give a lower bound on the conditional smooth min-entropy by trusting Alice's
and Bob's devices. The simulation results indicate that, in the universal
composable security framework, the protocol can tolerate 2.5 dB and 6.5 dB
channel loss against coherent attacks with direct and reverse reconciliation,
respectively.
