LOW3.1

PYSEC-2026-76

Quick fix

PYSEC-2026-76 — langchain-openai: upgrade to the fixed version with the command below.

pip install --upgrade 'langchain-openai>=1.1.14'

Details

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.

Are you affected?

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Affected packages

PyPI/langchain-openai

Introduced in: 0Fixed in: 1.1.14

Fixpip install --upgrade 'langchain-openai>=1.1.14'

References

https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r[ADVISORY]