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.
Metrics
Affected Vendors & Products
No data.
No data.
No data.
No data.
References
History
Tue, 14 Apr 2026 02:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | MaxKB: Sandbox Result Validation Bypass via Tool Output Spoofing | |
| Weaknesses | CWE-290 CWE-693 CWE-74 |
|
| References |
| |
| Metrics |
cvssV3_1
|
MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-04-14T01:03:40.653Z
Reserved: 2026-04-07T00:23:30.595Z
Link: CVE-2026-39419
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-04-14T02:16:05.143
Modified: 2026-04-14T02:16:05.143
Link: CVE-2026-39419
Redhat
No data.
OpenCVE Enrichment
No data.