CVE-2026-42335

Deferred Deferred - Pending Action

SSRF Bypass in MaxKB AI Assistant

Publication date: 2026-05-26

Last updated on: 2026-05-26

Assigner: GitHub, Inc.

Description

MaxKB is an open-source AI assistant for enterprise. Prior to 2.8.1, MaxKB v2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch (chat/api/oss/get_url) endpoint. The vulnerability exists due to inconsistent URL parsing between the urlparse validation function and the requests HTTP client, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-26

Last Modified

2026-05-26

Generated

2026-07-06

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-04

NVD

CVE-2026-42335

Affected Vendors & Products

Currently, no data is known.

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 in MaxKB versions 2.8.0 and prior is a server-side request forgery (SSRF) bypass in the OSS file service URL fetch endpoint (chat/api/oss/get_url).

It occurs because of inconsistent URL parsing between the urlparse validation function and the requests HTTP client, which allows attackers to bypass security checks and access internal network services.

This issue was fixed in version 2.8.1.

Impact Analysis

This vulnerability can allow attackers to access internal network services that are normally protected from external access.

Such unauthorized access could lead to information disclosure, unauthorized actions within the internal network, or further exploitation of internal systems.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade MaxKB to version 2.8.1 or later, as this version contains the fix for the server-side request forgery (SSRF) bypass issue.

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