LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists

LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load with allowedobjects="all". This does not enable arbitrary Python object deserialization, but it does allow...

PYSEC-2026-2564 LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists

LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load with allowedobjects="all". This does not enable arbitrary Python object deserialization, but it does allow...

PT-2026-59221

LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load with allowed objects="all". This does not enable arbitrary Python object deserialization, but it does allo...

PT-2026-39304

Name of the Vulnerable Software and Affected Versions langchain versions prior to 0.3.27 Description LangChain contains runtime code paths that deserialize inputs, outputs, or other application-controlled payloads using overly broad object allowlists, specifically calling load with allowed...