CVE-2025-46059
📋 TL;DR
LangChain v0.3.51 contains an indirect prompt injection vulnerability in the GmailToolkit component that allows attackers to execute arbitrary code via crafted email messages. This affects applications using LangChain's Gmail integration without proper input validation. The vendor disputes this as a vulnerability, attributing it to improper implementation by users.
💻 Affected Systems
- langchain-ai
- langchain-community
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Limited code execution within the application context, potentially exposing sensitive data and allowing further exploitation.
If Mitigated
No impact if proper input validation and sandboxing are implemented per LangChain security guidelines.
🎯 Exploit Status
Exploitation requires sending a crafted email to a vulnerable Gmail account integrated with the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://python.langchain.com/docs/security/
Restart Required: No
Instructions:
No official patch available. Follow LangChain security practices for input validation and sandboxing.
🔧 Temporary Workarounds
Disable GmailToolkit
allRemove or disable GmailToolkit integration if not essential
Remove GmailToolkit imports and usage from code
Implement Input Validation
allAdd strict input validation and sanitization for email content
Implement custom validation wrappers around GmailToolkit functions
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using GmailToolkit
- Monitor email processing for unusual patterns and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check if using langchain v0.3.51 with GmailToolkit without proper input validationCheck Version:
pip show langchain | grep VersionVerify Fix Applied:
Verify that input validation and sandboxing are properly implemented per LangChain security guidelines📡 Detection & Monitoring
Log Indicators:
- Unusual email processing patterns
- Unexpected code execution in LangChain processes
Network Indicators:
- Suspicious email attachments or content being processed
- Outbound connections from LangChain to unexpected destinations
SIEM Query:
source="langchain" AND (event="code_execution" OR event="email_processing_error")