Security advisory

{
  "id": "5ca29a4149e8c67b12beb2aeb896586c4073c3265ab64c826765886819509a03",
  "url": "https://osv.dev/vulnerability/CVE-2020-15254",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15254",
    "summary": "Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the bounded channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when `Vec::from_iter` has allocated different sizes with the number of iterator elements. This has been fixed in crossbeam-channel 0.4.4.",
    "evidence": "osv:CVE-2020-15254",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-15254",
      "aliases": [
        "CVE-2020-15254",
        "CVE-2020-35904",
        "GHSA-m8h8-v6jh-c762",
        "GHSA-v5m7-53cv-f3hx",
        "RUSTSEC-2020-0052"
      ],
      "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/crossbeam-rs/crossbeam",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "48b13dc43cf19e0544d03d16f4b3da3d8b23f076"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:crossbeam_project:crossbeam:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.4.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "crossbeam-queue-0.2.3",
            "crossbeam-utils-0.7.2",
            "crossbeam-epoch-0.8.2",
            "crossbeam-channel-0.4.2",
            "crossbeam-queue-0.2.1",
            "crossbeam-utils-0.7.0",
            "crossbeam-queue-0.2.0",
            "crossbeam-epoch-0.8.0",
            "crossbeam-deque-0.7.2",
            "crossbeam-channel-0.4.0",
            "crossbeam-0.7.3",
            "crossbeam-0.7.2",
            "crossbeam-channel-0.3.9",
            "crossbeam-epoch-0.7.2",
            "crossbeam-utils-0.6.6",
            "crossbeam-queue-0.1.2",
            "crossbeam-deque-0.7.1",
            "crossbeam-channel-0.3.8",
            "crossbeam-queue-0.1.1",
            "crossbeam-utils-0.6.5",
            "crossbeam-0.7.1",
            "crossbeam-utils-0.6.4",
            "crossbeam-queue-0.1.0",
            "crossbeam-epoch-0.7.1",
            "crossbeam-deque-0.7.0",
            "crossbeam-channel-0.3.7",
            "crossbeam-0.7.0",
            "crossbeam-channel-0.3.6",
            "crossbeam-channel-0.3.5",
            "crossbeam-epoch-0.7.0",
            "crossbeam-deque-0.6.3",
            "crossbeam-channel-0.3.4",
            "crossbeam-0.6.0",
            "crossbeam-utils-0.6.3",
            "crossbeam-channel-0.3.3",
            "crossbeam-utils-0.6.2",
            "crossbeam-channel-0.3.2",
            "crossbeam-utils-0.6.1",
            "crossbeam-0.5.0",
            "crossbeam-utils-0.6.0",
            "crossbeam-epoch-0.6.1",
            "crossbeam-deque-0.6.2",
            "crossbeam-channel-0.3.1",
            "v0.4.1",
            "v0.4.0",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "0.2.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15254.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:53.768181968Z",
      "provider": "osv",
      "references": [
        "https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hx",
        "https://github.com/RustSec/advisory-db/pull/425",
        "https://github.com/crossbeam-rs/crossbeam/pull/533",
        "https://github.com/crossbeam-rs/crossbeam/issues/539"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15254",
        "evidence": "/id"
      },
      {
        "value": "CVE-2020-35904",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383100,
  "published_at": "2020-10-16T17:15:12.057+00:00"
}