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angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding

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.

CWE-918Apr 24, 2026
CVSS3.1v3.1EPSS0.158%PoCs0SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templatesSTIX