Security advisory

{
  "id": "dbaa27b18b7df457f605fe8ff1d970e1bce46eb6b1a0d7268b4b0f9957ff4ffe",
  "url": "https://osv.dev/vulnerability/CVE-2020-35917",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-35917",
    "summary": "An issue was discovered in the pyo3 crate before 0.12.4 for Rust. There is a reference-counting error and use-after-free in From>.",
    "evidence": "osv:CVE-2020-35917",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-35917",
      "aliases": [
        "CVE-2020-35917",
        "GHSA-2vx6-fcw6-hpr6",
        "RUSTSEC-2020-0074"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pyo3/pyo3",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0fdd09afda0c60562ced9df8734778de8555eb10"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pyo3_project:pyo3:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.12.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.12.3",
            "v0.11.1",
            "v0.11.0",
            "v0.10.0",
            "v0.10.1",
            "v0.9.1",
            "v0.9.0",
            "v0.9.0-alpha.1",
            "v0.8.5",
            "v0.8.4",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.0",
            "v0.7.0-alpha.1",
            "v0.6.0",
            "pyo3-derive-backend-0.6.0",
            "v0.6.0-alpha.4",
            "v0.6.0-alpha.3",
            "v0.6.0-alpha.2",
            "v0.6.0-alpha.1",
            "v0.5.0",
            "v0.5.0-alpha.3",
            "v0.5.0-alpha.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "0.2.2",
            "v0.2.1",
            "0.2.1",
            "v0.2.0",
            "0.2.0",
            "v0.1.0",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35917.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:38.860974311Z",
      "provider": "osv",
      "references": [
        "https://rustsec.org/advisories/RUSTSEC-2020-0074.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-35917",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434548,
  "published_at": "2020-12-31T09:15:15.833+00:00"
}