langchain-ai langchain up to 0.3.84/1.3.2 load deserialization

Summaryinfo

A vulnerability, which was classified as critical, has been found in langchain-ai langchain up to 0.3.84/1.3.2. This affects the function Load. The manipulation leads to deserialization. This vulnerability is uniquely identified as CVE-2026-44843. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in langchain-ai langchain up to 0.3.84/1.3.2. This issue affects the function load. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-44843 since 05/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.3.85 or 1.3.3 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langchain-ai

Name

• langchain

Version

• 0.3.0
• 0.3.1
• 0.3.2
• 0.3.3
• 0.3.4
• 0.3.5
• 0.3.6
• 0.3.7
• 0.3.8
• 0.3.9
• 0.3.10
• 0.3.11
• 0.3.12
• 0.3.13
• 0.3.14
• 0.3.15
• 0.3.16
• 0.3.17
• 0.3.18
• 0.3.19
• 0.3.20
• 0.3.21
• 0.3.22
• 0.3.23
• 0.3.24
• 0.3.25
• 0.3.26
• 0.3.27
• 0.3.28
• 0.3.29
• 0.3.30
• 0.3.31
• 0.3.32
• 0.3.33
• 0.3.34
• 0.3.35
• 0.3.36
• 0.3.37
• 0.3.38
• 0.3.39
• 0.3.40
• 0.3.41
• 0.3.42
• 0.3.43
• 0.3.44
• 0.3.45
• 0.3.46
• 0.3.47
• 0.3.48
• 0.3.49
• 0.3.50
• 0.3.51
• 0.3.52
• 0.3.53
• 0.3.54
• 0.3.55
• 0.3.56
• 0.3.57
• 0.3.58
• 0.3.59
• 0.3.60
• 0.3.61
• 0.3.62
• 0.3.63
• 0.3.64
• 0.3.65
• 0.3.66
• 0.3.67
• 0.3.68
• 0.3.69
• 0.3.70
• 0.3.71
• 0.3.72
• 0.3.73
• 0.3.74
• 0.3.75
• 0.3.76
• 0.3.77
• 0.3.78
• 0.3.79
• 0.3.80
• 0.3.81
• 0.3.82
• 0.3.83
• 0.3.84
• 1.3.0
• 1.3.1
• 1.3.2

Website

• Product: https://github.com/langchain-ai/langchain/

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CPE 2.2info

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