Description
LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in versions 0.3.81 and 1.2.5.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected products
- langchain-ai / langchain>= 1.0.0, < 1.2.5 – >= 1.0.0, < 1.2.5
- langchain-ai / langchain< 0.3.81 – < 0.3.81
References
- VENDOR_ADVISORYhttps://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm
- PATCHhttps://github.com/langchain-ai/langchain/pull/34455
- PATCHhttps://github.com/langchain-ai/langchain/pull/34458
- PATCHhttps://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8
- PATCHhttps://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6
- PATCHhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81
- PATCHhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5