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CVE-2026-26013— LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages

Quick assessment

Affected
langchain-ai langchain
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 1.2.11之前版本存在代码问题漏洞，该漏洞源于ChatOpenAI.get_num_tokens_from_messages()方法在计算令牌数时未验证image_url值，可能导致服务端请求伪造攻击。

CVSS 3.7 · Low EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-26013

Vulnerability Information
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Vulnerability Title
LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages
Source: CVE Program / CVE List V5
Vulnerability Description
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.2.11, the ChatOpenAI.get_num_tokens_from_messages() method fetches arbitrary image_url values without validation when computing token counts for vision-enabled models. This allows attackers to trigger Server-Side Request Forgery (SSRF) attacks by providing malicious image URLs in user input. This vulnerability is fixed in 1.2.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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 1.2.11之前版本存在代码问题漏洞，该漏洞源于ChatOpenAI.get_num_tokens_from_messages()方法在计算令牌数时未验证image_url值，可能导致服务端请求伪造攻击。
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 < 1.2.11 -

II. Public POCs for CVE-2026-26013

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III. Intelligence Information for CVE-2026-26013

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Patches & Fixes for CVE-2026-26013 (1)

Vendor Advisories for CVE-2026-26013 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-26013

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