CVE-2026-79919

Deferred Deferred - Pending Action

Privilege Escalation in MaxKB via LD_PRELOAD Sandbox Bypass

Publication date: 2026-09-21

Last updated on: 2026-09-21

Assigner: GitHub, Inc.

Description

MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.6-lts, function-library code running under the LD_PRELOAD sandbox can invoke ctypes.CDLL from an importlib.abc.MetaPathFinder callback so the dlopen call-stack heuristic sees a Python import frame, then use unhooked dlsym with RTLD_NEXT to resolve glibc's real syscall and bypass the sandbox syscall blacklist. An authenticated workspace member can consequently read or write files, execute processes, or access networks as the sandbox user. This issue is fixed in version 2.10.6-lts.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-21

Last Modified

2026-09-21

Generated

2026-09-22

AI Q&A

2026-09-22

EPSS Evaluated

N/A

NVD

CVE-2026-79919

Affected Vendors & Products

Vendor	Product	Version / Range
maxkb	maxkb	to 2.10.6-lts (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

MaxKB is an open-source AI assistant for enterprises. A vulnerability in versions before 2.10.6-lts allows function-library code running under the LD_PRELOAD sandbox to bypass syscall blacklists. This is done by invoking ctypes.CDLL from an importlib.abc.MetaPathFinder callback, which tricks the dlopen call-stack heuristic into seeing a Python import frame. The attacker can then use unhooked dlsym with RTLD_NEXT to resolve glibc's real syscall and bypass restrictions.

Detection Guidance

Detection requires checking if MaxKB versions prior to 2.10.6-lts are running. Inspect installed versions via package managers or application logs. No specific commands are provided in the context.

Impact Analysis

An authenticated workspace member can exploit this vulnerability to read or write files, execute processes, or access networks as the sandbox user. This could lead to unauthorized data access, system compromise, or further lateral movement within the network.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements and HIPAA's security rules. Organizations using MaxKB may face compliance breaches, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Upgrade MaxKB to version 2.10.6-lts or later immediately. Remove unauthorized access for workspace members until the update is applied. Monitor for suspicious activity post-upgrade.

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