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Sandbox escape via unhooked fexecve

Moderate
liuruibin published GHSA-9mh9-v949-fwqh Sep 3, 2026

Package

MaxKB

Affected versions

<=v2.10.5-lts

Patched versions

v2.10.6-lts

Description

A sandbox escape vulnerability exists in MaxKB's ToolExecutor component.
The sandbox has hooked system calls such as execve/execvpe/execveat to disable subprocess , but fexecve is not hooked.
Attackers may escape sandbox using fexecve call.

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVE ID

CVE-2026-79918

Weaknesses

No CWEs