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CVE-2026-42336— MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch

Quick assessment

Affected
1Panel-dev MaxKB
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.

MaxKB是1Panel-dev开源的一款基于大语言模型和 RAG 的开源知识库问答系统。 MaxKB 2.8.0及之前版本存在代码问题漏洞，该漏洞源于OSS文件服务URL获取功能中存在服务端请求伪造绕过漏洞，可能导致攻击者访问内部网络服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1113 · Screen Capture

Affected Version Matrix 1

VendorProduct Version RangeStatus
1Panel-dev MaxKB < 2.8.1 affected
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I. Basic Information for CVE-2026-42336

Vulnerability Information
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Vulnerability Title
MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
MaxKB 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MaxKB是1Panel-dev开源的一款基于大语言模型和 RAG 的开源知识库问答系统。 MaxKB 2.8.0及之前版本存在代码问题漏洞，该漏洞源于OSS文件服务URL获取功能中存在服务端请求伪造绕过漏洞，可能导致攻击者访问内部网络服务。
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
1Panel-dev MaxKB < 2.8.1 -

II. Public POCs for CVE-2026-42336

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III. Intelligence Information for CVE-2026-42336

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Vendor Advisories for CVE-2026-42336 (1)

Same Patch Batch · 1Panel-dev · 2026-05-26 · 6 CVEs total

CVE-2026-44847 7.5 HIGH MaxKB: Webhook Trigger Authentication Bypass
CVE-2026-42337 MaxKB: Broken Access Control in MaxKB OSS URL Fetch API
CVE-2026-42335 MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy
CVE-2026-45412 MaxKB: Unauthenticated SSRF via Workflow Template Import
CVE-2026-45413 MaxKB: Unsalted MD5 Password Hashing

IV. Related Vulnerabilities

Same product: MaxKB
Same vendor: 1Panel-dev
Same weakness: CWE-367

V. Comments for CVE-2026-42336

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