CVE-2026-39421: MaxKB is an open-source AI assistant for enterprise

Q: How do I fix CVE-2026-39421?

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

Q: Is CVE-2026-39421 being exploited?

CVE-2026-39421 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-2026-39421 affect?

CVE-2026-39421 affects maxkb. Severity is medium (CVSS 6.3). MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a sandbox escape vulnerability in the ToolExecutor component. By leveraging Python's ctypes library to execute raw system calls, an authenticated attacker

Q: How urgent is CVE-2026-39421?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2026-39421 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. Versions 2.7.1 and below contain a sandbox escape vulnerability in the ToolExecutor component. By leveraging Python's ctypes library to execute raw system calls, an authenticated attacker with workspace privileges can bypass the LD_PRELOAD-based sandbox.so module to achieve arbitrary code execution via direct kernel system calls, enabling full network exfiltration and container compromise. The

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	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-94, 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 22:10 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-2026-39421?

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

Is CVE-2026-39421 being exploited?

CVE-2026-39421 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-2026-39421 affect?

CVE-2026-39421 affects maxkb. Severity is medium (CVSS 6.3). MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a sandbox escape vulnerability in the ToolExecutor component. By leveraging Python's ctypes library to execute raw system calls, an authenticated attacker

How urgent is CVE-2026-39421?

Priority 27/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-39424 MEDIUM 4.7 UPGRADE MaxKB is an open-source AI assistant for enterprise
CVE-2026-39425 MEDIUM 5.4 UPGRADE MaxKB is an open-source AI assistant for enterprise
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
CVE-2026-39420 MEDIUM 6.3 UPGRADE MaxKB is an open-source AI assistant for enterprise

References

← Back to latest CVEs