> CVE-2026-39421 [MEDIUM]

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PUBLISHED
2026-04-14 01:16
MODIFIED
2026-04-14 01:16
CVSS_SCORE V3
6.3
EPSS (Prob. Exploit)
0.26%
Top 81.6%
DATA SOURCES:
NVD 🔗 2026-04-14 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 OSV 🔗 2026-11-02

> DESCRIPTION

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 library intercepts critical standard system functions such as execve, system, connect, and open. It also intercepts mprotect to prevent PROT_EXEC (executable memory) allocations within the sandboxed Python processes, but pkey_mprotect is not blocked. This issue has been fixed in version 2.8.0.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EXPLOITABILITY
2.8
IMPACT
3.4

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-94 CWE-693

> CWE DETAILED DESCRIPTIONS

CWE-94: Improper Control of Generation of Code - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. | CWE-693: Protection Mechanism Failure - The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

MaxKB: Sandbox escape via ctypes and unhooked SYS_pkey_mprotect

AFFECTED PACKAGES:
Unknown / Unknown
33 versions affected
ALIASES:
GHSA-9c6w-j7w5-3gf7

> HISTORIQUE DES MODIFICATIONS

Première apparition
14/04/2026 01:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-94: Improper Control of Generation of Code ('Code Injection') - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not n...
Nouvelle valeur:
CWE-94: Improper Control of Generation of Code - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorr...
📊 ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-94: Improper Control of Generation of Code ('Code Injection') - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not n...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/1Panel-dev/MaxKB/commit/479701a4d2e6059506bad0057a66bed91abb5...
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-9c6w-j7w5-3gf7
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