CVE-2026-26013: Langchain Core

Low severity, CVSS 3.7. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Langchain Langchain Core: before 1.2.11 (fixed in 1.2.11)

Published 2026-02-10. Last modified 2026-06-17.