Bug 2481695 (CVE-2026-44843)

Summary: CVE-2026-44843 langchain: LangChain: Information disclosure and data integrity compromise via insecure deserialization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anpicker, bbrownin, bparees, dfreiber, drow, dschmidt, hasun, jburrell, jfula, jlanda, jowilson, kshier, mbarnett, nyancey, ometelka, ptisnovs, rjohnson, simaishi, stcannon, syedriko, teagle, vkumar, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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 crafted LangChain serialized constructor dictionaries, leading to the instantiation of classes with untrusted arguments. This can result in the disclosure of sensitive information and potential partial compromise of data integrity.
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Description OSIDB Bzimport 2026-05-26 21:01:41 UTC 
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 allowed_objects="all". This does not enable arbitrary Python object deserialization, but it does allow any trusted LangChain-serializable object to be revived, which is broader than these runtime paths require. As a result, attacker-supplied LangChain serialized constructor dictionaries may cause trusted runtime paths to instantiate classes with untrusted constructor arguments. This vulnerability is fixed in 0.3.85 and 1.3.3.