Security advisory

{
  "id": "b8ce39dd61c2003fd76ad3d0b824b37970f3befa8992eef5b0766cb4fb1331f2",
  "url": "https://osv.dev/vulnerability/CVE-2020-25576",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-25576",
    "summary": "An issue was discovered in the rand_core crate before 0.4.2 for Rust. Casting of byte slices to integer slices mishandles alignment constraints.",
    "evidence": "osv:CVE-2020-25576",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-25576",
      "aliases": [
        "CVE-2020-25576",
        "GHSA-mmc9-pwm7-qj5w",
        "RUSTSEC-2019-0035"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rust-random/rand",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "da917e673f49116f2f1bf37ea1ee5a99fe3c8c5d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:rust-random:rand:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "rand_core-0.1.0",
            "rand_pcg-0.3.1",
            "rand_hc-0.3.1",
            "rand_distr-0.4.1",
            "rand_core-0.6.3",
            "0.8.4",
            "rand_chacha-0.3.1",
            "rand_core-0.6.2",
            "0.8.3",
            "0.8.2",
            "rand_core-0.6.1",
            "0.8.1",
            "rand_distr-0.4.0",
            "0.8.0",
            "rand_pcg-0.3.0",
            "rand_hc-0.3.0",
            "rand_core-0.6.0",
            "rand_chacha-0.3.0",
            "rand_chacha-0.2.2",
            "0.7.3",
            "rand_pcg-0.2.1",
            "0.7.2",
            "0.7.1",
            "rand_distr-0.2.2",
            "rand_xoshiro-0.4.0",
            "rand_os-0.2.2",
            "rand_core-0.5.1",
            "rand_xoshiro-0.3.1",
            "rand_os-0.2.1",
            "rand_jitter-0.1.0",
            "rand_core-0.4.0",
            "rand_chacha-0.2.1",
            "rand_distr-0.2.1",
            "0.7.0",
            "rand_xoshiro-0.3.0",
            "rand_xorshift-0.2.0",
            "rand_pcg-0.2.0",
            "rand_isaac-0.2.0",
            "rand_hc-0.2.0",
            "rand_distr-0.2.0",
            "0.7.0-pre.1",
            "rand_xoshiro-0.2.1",
            "rand_xorshift-0.1.2",
            "rand_os-0.2.0",
            "rand_jitter-0.2.0",
            "rand_isaac-0.1.2",
            "rand_hc-0.1.1",
            "rand_core-0.5.0",
            "rand_chacha-0.2.0",
            "rand_os-0.1.3",
            "rand_pcg-0.1.2",
            "rand_jitter-0.1.3",
            "rand_jitter-0.1.2",
            "rand_jitter-0.1.1",
            "rand_os-0.1.2",
            "0.6.5",
            "rand_os-0.1.1",
            "0.6.4",
            "0.6.3",
            "rand_xoshiro-0.1.0",
            "0.6.2",
            "rand_xorshift-0.1.1",
            "rand_os-0.1.0",
            "rand_chacha-0.1.1",
            "rand_isaac-0.1.1",
            "0.6.1",
            "0.6.0",
            "0.6.0-pre.1",
            "rand_hc-0.1.0",
            "rand_isaac-0.1.0",
            "rand_hc128-0.1.0",
            "rand_chacha-0.1.0",
            "0.6.0-pre.0",
            "rand_core-0.2.0",
            "0.5.0",
            "rand_core-0.2.0-pre.0",
            "0.5.0-pre.2",
            "0.5.0-pre.1",
            "0.5.0-pre.0",
            "rand_core-0.1.0-pre.0",
            "0.4.1",
            "0.4.0-pre.0",
            "0.3.18",
            "0.3.17",
            "0.1.1",
            "rand_derive-0.3.1",
            "rand_derive-0.3.0",
            "0.3.16",
            "0.3.15",
            "0.3.14",
            "0.3.13",
            "rand_macros-0.1.10",
            "0.3.12",
            "rand_macros-0.1.9",
            "0.3.11",
            "0.3.10",
            "0.3.9",
            "rand_macros-0.1.7",
            "0.3.8",
            "rand_macros-0.1.6",
            "0.3.7",
            "0.3.6",
            "0.3.5",
            "0.3.4",
            "rand_macros-0.1.5",
            "0.3.3",
            "0.3.2",
            "0.3.1",
            "0.3.0",
            "0.2.1",
            "0.2.0",
            "0.1.4",
            "0.1.3",
            "rand_macros-0.1.4",
            "rand_macros-0.1.3",
            "rand_macros-0.1.2",
            "derive_rand-0.1.1",
            "0.1.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25576.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:32.266889513Z",
      "provider": "osv",
      "references": [
        "https://rustsec.org/advisories/RUSTSEC-2019-0035.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-25576",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432989,
  "published_at": "2020-09-14T19:15:11.473+00:00"
}