LlamaIndex (run-llama/llamaindex) versions up to and including 0.11.6 contain an unsafe deserialization vulnerability in BGEM3Index.loadfromdisk() in llamaindex/indices/managed/bgem3/base.py. The function uses pickle.load() to deserialize multiembedstore.pkl from a user-supplied persistdir without validation. An attacker who can provide a crafted persist directory containing a malicious pickle file can trigger arbitrary code execution when the victim loads the index from disk.