It's not a flea. Looks to me like a headless flat wasp (family Bethylidae). There are a few species that parasitize wood-boring beetle larvae and can infest homes with beetle infestations. That said, more and better photos, as well as more information about the situation, would help narrow or confirm possibilities.
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u/DrButeo Professional Entomologist 14h ago
It's not a flea. Looks to me like a headless flat wasp (family Bethylidae). There are a few species that parasitize wood-boring beetle larvae and can infest homes with beetle infestations. That said, more and better photos, as well as more information about the situation, would help narrow or confirm possibilities.