Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langchain | Langchain Core | < 0.3.81 |
Related Weaknesses (CWE)
References
- https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6aPatch
- https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f56Patch
- https://github.com/langchain-ai/langchain/pull/34455Issue TrackingPatch
- https://github.com/langchain-ai/langchain/pull/34458Issue TrackingPatch
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.8Release Notes
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5Release Notes
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cExploitVendor Advisory
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cExploitVendor Advisory
FAQ
What is CVE-2025-68664?
CVE-2025-68664 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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() functio...
How severe is CVE-2025-68664?
CVE-2025-68664 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-68664?
Check the references section above for vendor advisories and patch information. Affected products include: Langchain Langchain Core.