ZDI 2026-03-03

ZDI-26-135: LangChain LangGraph BaseCache Deserialization of Untrusted Data Remote Code Execution Vulnerability

CVE-2026-27794

Machine-generated analysis · WAYSCloud LLM

The vulnerability involves deserialization of untrusted data in LangChain LangGraph, which could lead to remote code execution without authentication.

Context

The affected component is LangChain LangGraph, specifically its BaseCache functionality. The vulnerability is a deserialization of untrusted data issue that enables remote code execution. Authentication is not required for exploitation. The advisory notes a CVSS score of 8.1, indicating high severity according to the scoring system.

Operator considerations

Check: Identify deployments of LangChain LangGraph using BaseCache functionality.

From Zero Day Initiative ↗

This vulnerability allows remote attackers to execute arbitrary code on affected installations of LangChain LangGraph. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-27794.

Read the full advisory on ZDI →