CVE-2026-39420: MaxKB is an open-source AI assistant for enterprise

Q: How do I fix CVE-2026-39420?

maxkb: upgrade to 2.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39420 being exploited?

CVE-2026-39420 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39420 affect?

CVE-2026-39420 affects maxkb. Severity is medium (CVSS 6.3). 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

Q: How urgent is CVE-2026-39420?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2026-39420 is a medium-severity flaw (CVSS 6.3) affecting maxkb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 the attacker can clear the environment variables and drop the sandbox.so hook, leading to unrestricted Remote Code Execution (RCE) and network access. MaxKB restricts untrusted Python code execution via the Too

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-78, CWE-693
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: maxkb

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 01:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

maxkb maxkb UPGRADE

Affected: < 2.8.0

Fixed in: 2.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy maxkb || rpm -q maxkb || maxkb --version

2. UPGRADE to 2.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade maxkb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade maxkb

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39420?

maxkb: upgrade to 2.8.0. Exact commands for each OS are on this page.

Is CVE-2026-39420 being exploited?

CVE-2026-39420 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39420 affect?

CVE-2026-39420 affects maxkb. Severity is medium (CVSS 6.3). 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

How urgent is CVE-2026-39420?

Priority 32/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

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CVE-2026-39417 MEDIUM 4.6 UPGRADE MaxKB is an open-source AI assistant for enterprise
CVE-2026-39419 LOW 3.1 UPGRADE MaxKB is an open-source AI assistant for enterprise

References

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