Security Advisory

CVE-2026-41488

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-04-24 20:57:25

Last updated 2026-04-27 13:40:42

Assigner GitHub_M

CVSS score 3.1

State PUBLISHED

Description

LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.

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