LangChain SSRF Bypass Vulnerability Enables Access to Internal Services

What happened

A server-side request forgery vulnerability, tracked as CVE-2026-26019, was discovered in the @langchain/community package affecting versions up to 1.1.13. The flaw exists in the RecursiveUrlLoader component, which used improper URL validation allowing attackers to bypass domain restrictions and send requests to internal services and cloud metadata endpoints such as 169.254.169.254. Exploitation could allow attackers to access sensitive data including IAM credentials, tokens, and internal service information in environments running LangChain with privileged network access. The issue has been fixed in version 1.1.14, which introduced stricter origin validation and SSRF protections blocking private, loopback, and cloud metadata addresses. 

Who is affected

Organizations and developers using vulnerable versions of the @langchain/community package, particularly those deploying LangChain in cloud environments with access to internal services or metadata endpoints, are affected.

Why CISOs should care

The vulnerability affects AI application infrastructure that may have access to sensitive cloud metadata and internal services, creating exposure risks in environments using LangChain-based automation and AI workflows.

3 practical actions

• Upgrade LangChain immediately. Update to version 1.1.14 or later to remediate CVE-2026-26019. 
• Audit AI application components. Identify deployments using the RecursiveUrlLoader component in vulnerable versions. 
• Restrict internal network access. Limit AI crawler access to sensitive internal services and cloud metadata endpoints.