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CVE-2026-41488

3.1 low SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 3.1 · langchainNVD modified 2026-10-26 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:langchain:langchain-openai:*:*:*:*:*:*:*:*

References 1