CVE-2026-39419: MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an authenticated user can bypass…
CVE-2026-39419 · Severity: low · CVSS 3.1 · Published 2026-04-14
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-39419 being exploited in the wild.
How severe is CVE-2026-39419?
Low severity, with a CVSS score of 3.1, published 14 April 2026.
Which products and versions are affected?
Maxkb. The advisory does not name versions.
Is there a fix for CVE-2026-39419?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-39419?
Check whether you run Maxkb. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.