FKIE_CVE-2026-39888

Vulnerability from fkie_nvd - Published: 2026-04-08 21:17 - Updated: 2026-04-15 18:02
Severity ?
9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qf73-2hrx-xprpVendor Advisory
Impacted products
Vendor Product Version
praison praisonai *
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "34CC1B67-7607-48E7-BDB4-18F2E011807B",
              "versionEndExcluding": "1.5.115",
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  "descriptions": [
    {
      "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 \u2014 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 \u2014 bypassing every remaining security layer. This vulnerability is fixed in 1.5.115."
    }
  ],
  "id": "CVE-2026-39888",
  "lastModified": "2026-04-15T18:02:58.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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        "type": "Secondary"
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  "published": "2026-04-08T21:17:00.990",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
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      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qf73-2hrx-xprp"
    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-657"
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          "value": "CWE-693"
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      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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