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Context. Z\,CMa is a binary composed of an embedded Herbig Be and an FU Oriclass star separated by $\sim100$ au. Observational evidence indicate a complexenvironment in which each star has a circumstellar disk and drives a jet, andthe whole system is embedded in a large dusty envelope.  Aims. We aim to probe the circumbinary environment of Z\,CMa in the inner 400au in scattered light.  Methods. We use high contrast imaging polarimetry with VLT/NaCo at $H$ and$K_s$ bands.  Results. The central binary is resolved in both bands. The polarized imagesshow three bright and complex structures: a common dust envelope, a sharpextended feature previously reported in direct light, and an intriguing brightclump located $0\farcs3$ south of the binary, which appears spatially connectedto the sharp extended feature.  Conclusions.We detect orbital motion when compared to previous observations,and report a new outburst driven by the Herbig star. Our observations revealthe complex inner environment of Z\,CMa with unprecedented detail and contrast.

The inner environment of Z~CMa: High-Contrast Imaging Polarimetry with NaCo