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CVE-2026-39419— MaxKB: Sandbox Result Validation Bypass via Tool Output Spoofing

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 2.7.1及之前版本存在安全漏洞，该漏洞源于沙箱结果验证可被绕过，可能导致经过身份验证的用户伪造工具执行结果。

CVSS 3.1 · Low EPSS 0.35% · P26
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I. Basic Information for CVE-2026-39419

Vulnerability Information
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Vulnerability Title
MaxKB: Sandbox Result Validation Bypass via Tool Output Spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an authenticated user can bypass sandbox result validation and spoof tool execution results by exploiting Python frame introspection to read the wrapper's UUID from its bytecode constants, then writing a forged result directly to file descriptor 1 (bypassing stdout redirection). By calling sys.exit(0), the attacker terminates the wrapper before it prints the legitimate output, causing the MaxKB service to parse and trust the spoofed response as the genuine tool result. This issue has been fixed in version 2.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
MaxKB 安全漏洞
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 2.7.1及之前版本存在安全漏洞，该漏洞源于沙箱结果验证可被绕过，可能导致经过身份验证的用户伪造工具执行结果。
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 < 2.8.0 -

II. Public POCs for CVE-2026-39419

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III. Intelligence Information for CVE-2026-39419

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Patches & Fixes for CVE-2026-39419 (2)

Vendor Advisories for CVE-2026-39419 (1)

Same Patch Batch · 1Panel-dev · 2026-04-14 · 10 CVEs total

CVE-2026-39420 6.3 MEDIUM MaxKB: Sandbox escape via LD_PRELOAD bypass
CVE-2026-39421 6.3 MEDIUM MaxKB: Sandbox escape via ctypes and unhooked SYS_pkey_mprotect
CVE-2026-39418 5.0 MEDIUM MaxKB: SSRF via sandbox network hook bypass
CVE-2026-39417 4.6 MEDIUM MaxKB: RCE via MCP stdio command injection in workflow engine
CVE-2026-39424 MaxKB has CSV Injection in its Application Chat Export Functionality
CVE-2026-39423 Stored XSS via Eval Injection in EchartsRander Component
CVE-2026-39425 MaxKB: Stored XSS via Unsanitized html_rander Tags in Markdown Rendering
CVE-2026-39426 MaxKB: Stored XSS via Unsanitized iframe_render Parsing
CVE-2026-39422 MaxKB has Stored XSS via ChatHeadersMiddleware

IV. Related Vulnerabilities

Same product: MaxKB
Same vendor: 1Panel-dev
Same weakness: CWE-74

V. Comments for CVE-2026-39419

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