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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Maxkb | Maxkb | < 2.8.0 |
Related Weaknesses (CWE)
References
- https://github.com/1Panel-dev/MaxKB/commit/38c4cfecd065293ede0437f6fa76cf0116591Patch
- https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0Release Notes
- https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f3c8-p474-xwfvVendor Advisory
FAQ
What is CVE-2026-39419?
CVE-2026-39419 is a vulnerability with a CVSS score of 3.1 (LOW). 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...
How severe is CVE-2026-39419?
CVE-2026-39419 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39419?
Check the references section above for vendor advisories and patch information. Affected products include: Maxkb Maxkb.