| Component | LangChain |
| Severity | critical (CVSS 9.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
| Published (NVD) | 2025-12-23 |
| Last modified | 2026-06-17 |
| Affected versions | langchain_core < 0.3.81 langchain_core >= 1.0.0, < 1.2.5 |
| Fixed in | 0.3.81, 1.2.5 |
| Weakness | CWE-502 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade LangChain to
0.3.81or later (or the patched release of your branch: 1.2.5). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2025-68664
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm
- 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
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