CVE-2026-39419

LOW

3.1

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.

CVE Details

CVSS v3.1 Score3.1

SeverityLOW

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredLOW

User InteractionNONE

Published4/14/2026

Last Modified4/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

maxkb:maxkb

Weaknesses (CWE)

CWE-74CWE-290CWE-693

References

https://github.com/1Panel-dev/MaxKB/commit/38c4cfecd065293ede0437f6fa76cf0116591d25(security-advisories@github.com)

https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0(security-advisories@github.com)

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f3c8-p474-xwfv(security-advisories@github.com)

IOC Correlations

No correlations recorded

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