CVE-2025-68664
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 3.1
- 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - EPSS
- 43% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)
- CWE
- CWE-502
- Published
- Modified
- Record from
- the NVD, synced
Affected
- langchain:langchain_core
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-c67j-w6g6-q2cm | PyPI | langchain-core | >=1.0.0 <1.2.5 | 1.2.5 |
| GHSA-c67j-w6g6-q2cm | PyPI | langchain-core | <0.3.81 | 0.3.81 |
| PYSEC-2026-373 | PyPI | langchain-core | <0.3.81 >=1.0.0 <1.2.5 | 0.3.81, 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