🛡️ CVE-2026-39421
🟡 CVSS 6.3 — Medium ✅ No Known Exploit CWE-94 NVD
6.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a sandbox escape vulnerability in the ToolExecutor component. By leveraging Python's ctypes library to execute raw system calls, an authenticated attacker with workspace privileges can bypass the LD_PRELOAD-based sandbox.so module to achieve arbitrary code execution via direct kernel system calls, enabling full network exfiltration and container compromise. The library intercepts critical standard system functions such as execve, system, connect, and open. It also intercepts mprotect to prevent PROT_EXEC (executable memory) allocations within the sandboxed Python processes, but pkey_mprotect is not blocked. This issue has been fixed in version 2.8.0.

Details

Severity MEDIUM
CVSS Score 6.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CWE CWE-94
Public Exploit ✅ No
Source NVD
Published 2026-04-14
Updated 2026-06-02
Modified 2026-04-20

Affected Packages

Software From version Fixed in
maxkb — 2.8.0

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