FKIE_CVE-2025-56005

Vulnerability from fkie_nvd - Published: 2026-01-20 19:15 - Updated: 2026-06-30 03:16
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
cve@mitre.orghttps://github.com/bohmiiidd/Undocumented-RCE-in-PLYExploit, Third Party Advisory
cve@mitre.orghttps://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005Exploit, Third Party Advisory
cve@mitre.orghttps://github.com/tom025/ply_exploit_rejectionExploit, Mitigation, Third Party Advisory
cve@mitre.orghttps://github.com/tom025/ply_exploit_rejection/issues/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/23/4Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/23/5Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/28/5Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/29/1Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/29/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/01/30/1
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2025-56005
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2431308
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-56005.json
Impacted products
Vendor Product Version
dabeaz ply 3.11
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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              "version": "n/a"
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      "source": "cve@mitre.org"
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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:dabeaz:ply:3.11:*:*:*:*:*:*:*",
              "matchCriteriaId": "278FED9B-7970-410E-B5F5-C87B229441CC",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
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  ],
  "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": "2026-06-30T03:16:52.847",
  "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"
        },
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        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      },
      {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2026-01-20T18:47:19.926886Z",
          "version": "2.0.3"
        }
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  "published": "2026-01-20T19:15:49.247",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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        "Third Party Advisory"
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    },
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      "tags": [
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      "url": "https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005"
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    {
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    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
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          "value": "CWE-502"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.