What is CVE-2026-39420?

CVE-2026-39420 is a medium-severity vulnerability in 1panel-dev Maxkb, classified under OS Command Injection. CVSS score: 6.3/10. Published 2026-04-14.

How severe is CVE-2026-39420?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in 1panel-dev Maxkb

CVE-2026-39420

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an incomplete sandbox protection mechanism allows an authenticated user with tool execution privileges to escape the LD_PRELOAD-based sandbox. By env command…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.005 (38.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

1panel-dev Maxkb — versions < 2.8.0
Maxkb

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-39420?: CVE-2026-39420 is a medium-severity vulnerability in 1panel-dev Maxkb, classified under OS Command Injection. CVSS score: 6.3/10. Published 2026-04-14.
How severe is CVE-2026-39420?: Medium severity. CVSS v3 base score is 6.3 out of 10.