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CVE-2026-39888

Estado: AnalizadaCrítica (9.9)—

PraisonAI is a multi-agent teams system. Prior to 1.5.115, execute_code() in praisonaiagents.tools.python_tools defaults to sandbox_mode="sandbox", which runs user code in a subprocess wrapped with a restricted __builtins__ dict and an AST-based blocklist. The AST blocklist embedded inside the subprocess wrapper (blocked_attrs of python_tools.py) contains only 11 attribute names — a strict subset of the 30+ names blocked in the direct-execution path.

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The four attributes that form a frame-traversal chain out of the sandbox are all absent from the subprocess list (__traceback__, tb_frame, f_back, and f_builtins). Chaining these attributes through a caught exception exposes the real Python builtins dict of the subprocess wrapper frame, from which exec can be retrieved and called under a non-blocked variable name — bypassing every remaining security layer. This vulnerability is fixed in 1.5.115.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad en sandbox de ejecución remota de código en PraisonAI (CVSS crítico, AV:N/PR:L). Ataque remoto autenticado que escapa la restricción de builtins mediante traversal de atributos (__traceback__, tb_frame, f_back) para obtener exec(). Permite ejecución de comandos, acceso a datos del sis

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory Permissions

Tecnologías afectadas (1)

Praison — Praisonai

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-39888",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2026-39888",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-09T20:20:32.970513Z"
        }
      }
    ],
    "cvssMetricV31": [
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          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 9.9,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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          "baseSeverity": "CRITICAL",
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-657"
        },
        {
          "lang": "en",
          "value": "CWE-693"
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "PraisonAI is a multi-agent teams system. Prior to 1.5.115, execute_code() in praisonaiagents.tools.python_tools defaults to sandbox_mode=\"sandbox\", which runs user code in a subprocess wrapped with a restricted __builtins__ dict and an AST-based blocklist. The AST blocklist embedded inside the subprocess wrapper (blocked_attrs of python_tools.py) contains only 11 attribute names — a strict subset of the 30+ names blocked in the direct-execution path. The four attributes that form a frame-traversal chain out of the sandbox are all absent from the subprocess list (__traceback__, tb_frame, f_back, and f_builtins). Chaining these attributes through a caught exception exposes the real Python builtins dict of the subprocess wrapper frame, from which exec can be retrieved and called under a non-blocked variable name — bypassing every remaining security layer. This vulnerability is fixed in 1.5.115."
    },
    {
      "lang": "es",
      "value": "PraisonAI es un sistema de equipos multiagente. Antes de la versión 1.5.115, execute_code() en praisonaiagents.tools.python_tools por defecto usa sandbox_mode='sandbox', que ejecuta código de usuario en un subproceso envuelto con un diccionario __builtins__ restringido y una lista de bloqueo basada en AST. La lista de bloqueo AST incrustada dentro del envoltorio del subproceso (blocked_attrs de python_tools.py) contiene solo 11 nombres de atributos - un subconjunto estricto de los más de 30 nombres bloqueados en la ruta de ejecución directa. Los cuatro atributos que forman una cadena de recorrido de marcos fuera de la sandbox están todos ausentes de la lista del subproceso (__traceback__, tb_frame, f_back y f_builtins). Encadenar estos atributos a través de una excepción capturada expone el diccionario real de builtins de Python del marco del envoltorio del subproceso, desde el cual se puede recuperar y llamar a exec bajo un nombre de variable no bloqueado - eludiendo cada capa de seguridad restante. Esta vulnerabilidad está corregida en la versión 1.5.115."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "1.5.115"
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  "sourceIdentifier": "security-advisories@github.com"
}