CVE-2026-42336 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in MaxKB versions through 2.8.0. This vulnerability allows attackers to bypass private IP address restrictions and access internal network services. The issue arises in the OSS file service URL fetch functionality, specifically at the '/chat/api/oss/get_url' endpoint. The vulnerability is due to inconsistent DNS resolution between the validation phase and the actual request execution. During validation, the application checks for private IP addresses using a DNS lookup, but the subsequent request performs a separate DNS resolution, creating an opportunity for DNS rebinding attacks.
Users are advised to update MaxKB to version 2.8.1, which addresses the vulnerability by synchronizing the DNS resolution process. Alternatively, the official fix commit can be applied.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 26, 2026CISA-ADP
Assessed May 27, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-6m4p-9wwc-4q5q | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| 1Panel-dev MaxKB | <= 2.8.0 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | New CVE Received | [email protected] |