LangChain — Vulnerability (CVE-2025-65106)
Date: 2025-11
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2025-65106
CWE: CWE-1336

LangChain is a framework for building agents and LLM-powered applications. From versions 0.3.79 and prior and 1.0.0 to 1.0.6, a template injection vulnerability exists in LangChain's prompt template system that allows attackers to access Python object internals through template syntax. This vulnerability affects applications that accept untrusted template strings (not just template variables) in ChatPromptTemplate and related prompt template classes. This issue has been patched in versions 0.3.80 and 1.0.7.


Mitigations:

Architectural layers (MAESTRO):