CVE-2020-5234 affecting package python-msgpack 1.0.5-3

{
  "id": "02698d67bf4211e28b2fa287e2ff60993ad71918c4b29a1dfa1608e8a191c3f5",
  "url": "https://osv.dev/vulnerability/AZL-109523",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-5234 affecting package python-msgpack 1.0.5-3",
    "summary": "MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps.",
    "evidence": "osv:AZL-109523",
    "products": [
      {
        "name": {
          "value": "python-msgpack",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "AZL-109523",
      "aliases": [
        "AZL-109523"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1.0.5-3"
                }
              ]
            }
          ],
          "package": {
            "name": "python-msgpack",
            "purl": "pkg:rpm/azure-linux/python-msgpack",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109523.json"
          }
        }
      ],
      "modified": "2026-10-22T05:35:55Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-5234"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2020-5234"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2020-5234",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 404463,
  "published_at": "2020-01-31T18:15:11+00:00"
}