What’s Vulnerable › Vulnerabilities

CVE-2025-68664: LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 42.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-23 · updated 2026-10-19
• Weakness: CWE-502

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.

Affected products

• langchain-ai langchain: before 0.3.81; from 1.0.0 before 1.2.5 — fixed in 0.3.81, 1.2.5

How to fix

Upgrade to a fixed version: langchain-ai langchain 0.3.81, 1.2.5. Check the vendor advisory for mitigations.

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

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