Security advisory

{
  "id": "627d1f50445b61304abe1b8dfe47e1f61924950fc1b08a34d251f23e6276b796",
  "url": "https://osv.dev/vulnerability/CVE-2020-36323",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-36323",
    "summary": "In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.",
    "evidence": "osv:CVE-2020-36323",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-36323",
      "aliases": [
        "CVE-2020-36323"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rust-lang/rust",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "88f19c6dab716c6281af7602e30f413e809c5974"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.52.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0-beta",
            "1.0.0-alpha.2",
            "1.0.0-alpha",
            "0.9",
            "0.8",
            "release-0.7",
            "0.7",
            "release-0.6",
            "0.6",
            "release-0.5",
            "0.5",
            "release-0.4",
            "0.4",
            "release-0.2",
            "0.2",
            "release-0.1",
            "0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-36323.json"
          }
        }
      ],
      "modified": "2026-10-24T10:50:06.268448959Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/",
        "https://github.com/rust-lang/rust/issues/80335",
        "https://github.com/rust-lang/rust/pull/81728",
        "https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174",
        "https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "rust-lang:rust",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.52.0"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  },
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  },
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-36323",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 441955,
  "published_at": "2021-04-14T07:15:12.087+00:00"
}