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CVE-2026-41488— angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding

Quick assessment

Affected
langchain-ai langchain-openai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 3.1 · Low EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-41488

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Vendor Advisories for CVE-2026-41488 (1)

IV. Related Vulnerabilities

Same vendor: langchain-ai
Same weakness: CWE-918

V. Comments for CVE-2026-41488

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