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 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.
- Affected products
- Langchain
- Langchain
- < 0.3.85, 1.3.3
- Fix
- Available
- CVSS 3.1
- 8.2 HIGH
- EPSS
- 0.4% (33th percentile)
- Weakness
- CWE-502
- NVD status
- Analyzed
- Published
- 2026-05-26
No indexed exploits for CVE-2026-44843 yet
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