CVE-2026-42336
Deferred Deferred - Pending Action
Server-Side Request Forgery Bypass in MaxKB

Publication date: 2026-05-26

Last updated on: 2026-05-26

Assigner: GitHub, Inc.

Description
MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch functionality due to inconsistent DNS resolution between validation and actual request execution, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.
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Meta Information
Published
2026-05-26
Last Modified
2026-05-26
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-14
NVD
CVE-2026-42336
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
maxkb maxkb to 2.8.1 (exc)
maxkb maxkb 2.8.1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
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.
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Executive Summary

The vulnerability in MaxKB versions 2.8.0 and prior is a server-side request forgery (SSRF) bypass. It occurs in the OSS file service URL fetch functionality due to inconsistent DNS resolution between the validation step and the actual request execution. This inconsistency allows attackers to bypass security checks and access internal network services that should be protected.

Impact Analysis

This vulnerability can allow an attacker to access internal network services that are normally not accessible from outside the network. This could lead to unauthorized access to sensitive internal resources, potential data exposure, or further exploitation within the internal network.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade MaxKB to version 2.8.1 or later, where the SSRF bypass issue has been fixed.

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