CVE-2025-68664
critical · 9.3LangChain 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.
9.3
CVSS
42.9%
EPSS (exploit prob.)
99th
EPSS percentile
2025-12-23
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Weaknesses
CWE-502
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| langchain | langchain_core | < 0.3.81 |
| langchain | langchain_core | >= 1.0.0, < 1.2.5 |
Check a specific version with /api/v1/cve/match.
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
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2025-68664