CVE-2026-26013

LOW3.7

LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages

Published Feb 10, 2026

Modified 3 weeks ago

Details

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.

References

WEB

https://github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c834565

WEB

https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.11

WEB

https://github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58r

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-26013

CVSS Analysis

CVSS v3.1

3.7