CVE-2026-77521

10 CRITICALpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw allows untrusted input to execute shell commands, leading to remote code execution. This is critical as it can be exploited by malicious chat content.
Exploitability: Exploitation requires untrusted chat or ingested content with command injection capabilities; preconditions include the use of versions prior to 2.10.5-lts.
Blast radius: If exploited, this could lead to complete compromise of affected systems and data loss.
Prioritized remediation: Update to version 2.10.5-lts or later to apply the necessary security patches.

rceshell-injectionsecurity-update

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool, skill, or sub-application use SandboxShellBackend, which exposes an execute shell tool without excluding it and omits execute from interrupt_on, so human approval is not required. Untrusted chat or ingested content can therefore cause command execution; source deployments with MAXKB_SANDBOX disabled run commands directly as the application user, while the official root container's string-based gosu wrapper allowed shell metacharacters to execute outside the intended sandbox. This issue is fixed in version 2.10.5-lts.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-78, CWE-250, CWE-749

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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