CVE-2025-65106: langchain-ai langchain

Vulnerability summary

CVE-2025-65106 is a high (CVSS 8.3) vulnerability in langchain-ai langchain. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 41.8% of scored vulnerabilities.

Timeline

1. 21-11-2025
   PublishedVulnerability first disclosed.
2. 21-11-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-1336Improper Neutralization of Special Elements Used in a Template EngineThe product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.