{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:dabeaz:ply:3.11:*:*:*:*:*:*:*",
              "matchCriteriaId": "278FED9B-7970-410E-B5F5-C87B229441CC",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [
    {
      "sourceIdentifier": "cve@mitre.org",
      "tags": [
        "disputed"
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully."
    },
    {
      "lang": "es",
      "value": "Una caracter\u00edstica indocumentada e insegura en la librer\u00eda PLY (Python Lex-Yacc) 3.11 permite la ejecuci\u00f3n remota de c\u00f3digo (RCE) a trav\u00e9s del par\u00e1metro \u0027picklefile\u0027 en la funci\u00f3n \u0027yacc()\u0027. Este par\u00e1metro acepta un archivo .pkl que se deserializa con \u0027pickle.load()\u0027 sin validaci\u00f3n. Debido a que \u0027pickle\u0027 permite la ejecuci\u00f3n de c\u00f3digo incrustado a trav\u00e9s de \u0027__reduce__()\u0027, un atacante puede lograr la ejecuci\u00f3n de c\u00f3digo pasando un archivo pickle malicioso. El par\u00e1metro no se menciona en la documentaci\u00f3n oficial ni en el repositorio de GitHub, sin embargo, est\u00e1 activo en la versi\u00f3n de PyPI. Esto introduce una puerta trasera sigilosa y un riesgo de persistencia. NOTA: Un tercero afirma que esta vulnerabilidad deber\u00eda ser rechazada porque la prueba de concepto no demuestra la ejecuci\u00f3n de c\u00f3digo arbitrario y no se completa con \u00e9xito."
    }
  ],
  "id": "CVE-2025-56005",
  "lastModified": "2026-02-06T20:16:08.237",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-20T19:15:49.247",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/bohmiiidd/Undocumented-RCE-in-PLY"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://github.com/tom025/ply_exploit_rejection"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/tom025/ply_exploit_rejection/issues/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/01/23/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/01/23/5"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/01/28/5"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/01/29/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/01/29/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/01/30/1"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}