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High severity8.2GHSA Advisory· Published May 26, 2026· Updated May 29, 2026

CVE-2026-44843

CVE-2026-44843

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
langchain-corePyPI
>= 1.0.0, < 1.3.31.3.3
langchain-corePyPI
< 0.3.850.3.85

Affected products

21

Patches

Vulnerability mechanics

References

3

News mentions

1