LangChain — Ssrf (CVE-2026-26013)
Date: 2026-02
Affected: langchain/langchain_core
Attack vector: ssrf
Category: vulnerability-disclosure
Severity: Low
CVE: CVE-2026-26013
CWE: CWE-918
CVSS: 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

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.


Mitigations:

Architectural layers (MAESTRO):