CVE-2026-40158

{
  "id": "CVE-2026-40158",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-10T17:17:13.603",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PraisonAI is a multi-agent teams system. Prior to 4.5.128, PraisonAI's AST-based Python sandbox can be bypassed using type.__getattribute__ trampoline, allowing arbitrary code execution when running untrusted agent code. The _execute_code_direct function in praisonaiagents/tools/python_tools.py uses AST filtering to block dangerous Python attributes like __subclasses__, __globals__, and __bases__. However, the filter only checks ast.Attribute nodes, allowing a bypass. The sandbox relies on AST-based filtering of attribute access but fails to account for dynamic attribute resolution via built-in methods such as type.getattribute, resulting in incomplete enforcement of security restrictions. The string '__subclasses__' is an ast.Constant, not an ast.Attribute, so it is never checked against the blocked list. This vulnerability is fixed in 4.5.128."
    },
    {
      "lang": "es",
      "value": "PraisonAI es un sistema de equipos multiagente. Antes de la 4.5.128, el sandbox de Python basado en AST de PraisonAI puede ser eludido utilizando el trampoline type.__getattribute__, permitiendo la ejecución de código arbitrario al ejecutar código de agente no confiable. La función _execute_code_direct en praisonaiagents/tools/python_tools.py utiliza filtrado AST para bloquear atributos peligrosos de Python como __subclasses__, __globals__ y __bases__. Sin embargo, el filtro solo verifica nodos ast.Attribute, permitiendo una elusión. El sandbox se basa en el filtrado basado en AST del acceso a atributos, pero no tiene en cuenta la resolución dinámica de atributos a través de métodos incorporados como type.getattribute, lo que resulta en una aplicación incompleta de las restricciones de seguridad. La cadena ’__subclasses__’ es un ast.Constant, no un ast.Attribute, por lo que nunca se verifica contra la lista bloqueada. Esta vulnerabilidad está corregida en la 4.5.128."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "MervinPraison",
          "product": "PraisonAI",
          "versions": [
            {
              "version": "< 4.5.128",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-10T18:31:02.529674Z",
          "id": "CVE-2026-40158",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-693"
        }
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    }
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  "configurations": [
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          "cpeMatch": [
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  "references": [
    {
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-3c4r-6p77-xwr7",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}