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.
CVSS 3.1EPSS 0.158%Risk 0.31
View source- Published
- 2026-04-24 21:16:19
- Affected versions
- <1.1.14
- Type
- Package
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N