CVE-2026-39420Network attack vector

Authenticated code execution via cleared LD_PRELOAD

Published Apr 14, 2026 · Updated Apr 14, 2026

Sandbox escape in FIT2CLOUD MaxKB 2.7.1 and earlier allows remote authenticated users to execute unrestricted code through Tool Debug. The sandbox permits env to clear LD_PRELOAD before launching Python, removing the sandbox.so hooks that intercept sensitive library calls. Tool execution and subprocess privileges are required; escaped code gains native file-system and network access in the application container.

CVSS severity6.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in FIT2CLOUD MaxKB 2.7.1 and earlier allows remote authenticated users to execute unrestricted code through Tool Debug. The sandbox permits env to clear LD_PRELOAD before launching Python, removing the sandbox.so hooks that intercept sensitive library calls. Tool execution and subprocess privileges are required; escaped code gains native file-system and network access in the application container.

The record

CVE
CVE-2026-39420
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
KubeOperator
Product
MaxKB
Classifications
CWE-78, CWE-693, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

KubeOperator · MaxKBversion=< 2.8.0

Published CVSS scores

6.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
7.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-693Protection Mechanism Failure
T1059.006Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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