Vulnerability Description
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.2.11, the ChatOpenAI.get_num_tokens_from_messages() method fetches arbitrary image_url values without validation when computing token counts for vision-enabled models. This allows attackers to trigger Server-Side Request Forgery (SSRF) attacks by providing malicious image URLs in user input. This vulnerability is fixed in 1.2.11.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langchain | Langchain Core | < 1.2.11 |
Related Weaknesses (CWE)
References
- https://github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a38Patch
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.1ProductRelease Notes
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58MitigationVendor Advisory
FAQ
What is CVE-2026-26013?
CVE-2026-26013 is a vulnerability with a CVSS score of 3.7 (LOW). LangChain is a framework for building agents and LLM-powered applications. Prior to 1.2.11, the ChatOpenAI.get_num_tokens_from_messages() method fetches arbitrary image_url values without validation w...
How severe is CVE-2026-26013?
CVE-2026-26013 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26013?
Check the references section above for vendor advisories and patch information. Affected products include: Langchain Langchain Core.