BREW-ANSIBLE-CMDB-CVE-20… (GHSA-3PQX-4FQF-J49F)

Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:40 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details

PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "pyyaml",
        "resource_purl": "pkg:pypi/pyyaml@6.0.2",
        "upstream_fixed_in": "5.2"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "ansible-cmdb",
        "purl": "pkg:brew/ansible-cmdb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.31_1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/pyyaml@6.0.2",
        "name": "pyyaml",
        "resource": "pyyaml",
        "strategy": "registry",
        "subject_version": "6.0.2"
      }
    ]
  },
  "details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
  "id": "BREW-ansible-cmdb-CVE-2019-20477",
  "modified": "2026-09-09T23:40:59Z",
  "published": "2026-08-13T16:35:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yaml/pyyaml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/download/47655"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Deserialization of Untrusted Data in PyYAML",
  "upstream": [
    "GHSA-3pqx-4fqf-j49f",
    "CVE-2019-20477",
    "PYSEC-2020-176"
  ]
}



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