LangChain Exposes Sensitive System Data Via Deserialization
Security researchers have identified a critical vulnerability in LangChain's core library, tracked as CVE-2025-68664, that can expose sensitive system data. The flaw arises from unsafe serialization/deserialization where untrusted input can include a reserved internal marker and be reconstructed as trusted objects, risking data leakage in logging, caching, or event streaming. Organizations using LangChain-based LLM applications should prioritize patches and sanitize serialized metadata.
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