CVE-2026-26013

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SSRF Vulnerability in LangChain ChatOpenAI Image URL Processing

Publication date: 2026-02-10

Last updated on: 2026-03-17

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-02-10

Last Modified

2026-03-17

Generated

2026-07-06

AI Q&A

2026-02-11

EPSS Evaluated

2026-07-05

NVD

CVE-2026-26013

EUVD

EUVD-2026-6240

Affected Vendors & Products

Vendor	Product	Version / Range
langchain	langchain_core	to 1.2.11 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

The vulnerability exists in LangChain versions prior to 1.2.11 in the ChatOpenAI.get_num_tokens_from_messages() method. This method fetches image URLs without validating them when calculating token counts for vision-enabled models. Because of this lack of validation, attackers can supply malicious image URLs in user input to trigger Server-Side Request Forgery (SSRF) attacks.

Impact Analysis

This vulnerability can allow attackers to perform SSRF attacks by making the server fetch arbitrary URLs. SSRF attacks can lead to unauthorized access to internal systems, exposure of sensitive information, or interaction with internal services that are not normally accessible from outside the network.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade LangChain to version 1.2.11 or later where the issue is fixed.

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