- CVSS
- CRITICAL · 9.3 v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
- Published
- 2025-12-23
- Weakness
- CWE-502
- Source
- nvd.nist.gov/vuln/detail/CVE-2025-68664
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.
References
- https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8
- https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6
- https://github.com/langchain-ai/langchain/pull/34455
- https://github.com/langchain-ai/langchain/pull/34458
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5
How GTK Cyber trains on this
AI security training at GTK Cyber covers the LLM and ML-pipeline vulnerability classes that vulnerabilities like CVE-2025-68664 fall into. Our hands-on courses are taught by Charles Givre and other practitioners who break and defend production AI systems.