CVE-2026-41488— angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding
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I. Basic Information for CVE-2026-41488
Vulnerability Information
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Vulnerability Title
angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
LangChain 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain是LangChain开源的一个用于开发由大型语言模型 （LLM） 提供支持的应用程序的框架。 LangChain 1.1.14之前版本存在代码问题漏洞，该漏洞源于langchain-openai的_url_to_size()辅助函数在SSRF保护验证URL后，在独立的网络操作中获取URL时存在TOCTOU/DNS重新绑定窗口，攻击者控制的主机名可在验证时解析为公共IP，在获取时解析为私有/本地主机IP。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| langchain-ai | langchain-openai | < 1.1.14 | - |
II. Public POCs for CVE-2026-41488
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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