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...

CVE-2026-44843

A flaw was found in LangChain, a framework for building agents and large language model LLM-powered applications. Older runtime code paths within LangChain deserialize application-controlled payloads using overly broad object allowlists. A remote attacker can exploit this by supplying specially...

CVE-2026-44843

LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, 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...

CVE-2026-44843

LangChain CVE-2026-44843 affects LangChain-core runtimes prior to 0.3.85 and 1.3.3, which use older code paths with broad object allowlists that can revive trusted LangChain-serializable objects via load()/loads() calls. This may let attacker-controlled serialized constructor dictionaries instant...

CVE-2026-44843 LangChain: Unsafe deserialization of attacker-controlled LangChain objects through overly broad `load()` allowlists

LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, 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...

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-2026-39304

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...