CVE-2026-39418: MaxKB is an open-source AI assistant for enterprise

Q: How do I fix CVE-2026-39418?

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

Q: Is CVE-2026-39418 being exploited?

CVE-2026-39418 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-2026-39418 affect?

CVE-2026-39418 affects maxkb. Severity is medium (CVSS 5.0). MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto() with the MSG_FASTOPEN flag. This allows authenticated user with tool-editing permissions t

Q: How urgent is CVE-2026-39418?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2026-39418 is a medium-severity flaw (CVSS 5.0) 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, sandbox network protection can be bypassed by using socket.sendto() with the MSG_FASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the sandbox's banned hosts configuration. MaxKB's sandbox uses LD_PRELOAD to hook the connect() function and block connections to banned IPs, but Linux's

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-918
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-2026-39418?

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

Is CVE-2026-39418 being exploited?

CVE-2026-39418 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-2026-39418 affect?

CVE-2026-39418 affects maxkb. Severity is medium (CVSS 5.0). MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto() with the MSG_FASTOPEN flag. This allows authenticated user with tool-editing permissions t

How urgent is CVE-2026-39418?

Priority 20/100. No elevated risk signals yet.

Related CVEs

CVE-2026-39421 MEDIUM 6.3 UPGRADE MaxKB is an open-source AI assistant for enterprise
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

References

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