Malicious code in @coopeuch/common (npm)

{
  "id": "df448f5f97d1bcb6bd1e54af96136c5a6fc64f6bad5e8934f7f74d1dc1a95d32",
  "url": "https://osv.dev/vulnerability/MAL-2026-17760",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in @coopeuch/common (npm)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (887c41c0805d7d223c499e702796cf46727b0be152b7c8a65607907afb3b5d59) @coopeuch/common@1.999.999 publishes to the public npm registry under a scope the publisher does not own, using an inflated version (1.999.999) consistent with the dependency-confusion technique that outranks internal-registry versions. The package's declared postinstall script (postinstall.js) runs automatically on npm install and collects installer-side host and network data — hostname, username, uid/gid, home directory, non-internal network interface addresses with MAC/CIDR, DNS resolver addresses, reverse-DNS internal FQDN, container markers, CI environment-variable presence, npm_config_registry, and the consuming project's package name/version/declared range — then POSTs it as JSON to the hardcoded author-controlled endpoint https://collector.oob.s4yhii.com/_npm-poc/beacon. A secondary DNS beacon is emitted via dns.lookup to a subdomain of oob.s4yhii.com. Any build that resolves @coopeuch/common from the public registry (including internal builds referencing the @coopeuch scope) will auto-exfiltrate internal hostnames, MAC addresses, usernames, internal registry URLs, and project identity to a third-party collector at install time. The package's README self-labels this as a coordinated-disclosure proof of concept; the harvesting and off-host upload nonetheless occur without installer opt-in. ## Source: ghsa-malware (7b",
    "evidence": "osv:MAL-2026-17760",
    "products": [
      {
        "name": {
          "value": "@coopeuch/common",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.999.999",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17760",
      "aliases": [
        "GHSA-5h58-475h-6287",
        "MAL-2026-17760"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "@coopeuch/common",
            "purl": "pkg:npm/%40coopeuch/common",
            "ecosystem": "npm"
          },
          "versions": [
            "1.999.999"
          ],
          "database_specific": {
            "cwes": [
              {
                "name": "Embedded Malicious Code",
                "cweId": "CWE-506",
                "description": "The product contains code that appears to be malicious in nature."
              },
              {
                "name": "Embedded Malicious Code",
                "cweId": "CWE-506",
                "description": "The product contains code that appears to be malicious in nature."
              }
            ],
            "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/common/MAL-2026-17760.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "postinstall.js",
                  "tlsh": "0ae1fa6a05fe1132226235f4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed",
                  "sha256": "c859191e9d7e04d59b5d2f566799feb31594a68573350bd17661be469e8663ef"
                },
                {
                  "path": "package.json",
                  "tlsh": "1ee02230c5314f33a4d829a90d37264660aa296387083c2863eb426c4bdc77b88ff32d",
                  "sha256": "0460202496c4e21d871ff51598019aeb1d27b5083ebf22611dc5456a64d0dbaa"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "f1278ee12b8adc385a28b5847ebbaef5f4e41be7",
                    "sha512_sri": "sha512-aVYGJ0N6KMZH6QKeZwlw88VVV1+9Nh1lLGmbI/R7fCWJvnLnoiBRe7op2ptvfDIokoyiyPKyCuvJmvfs33mT0Q=="
                  },
                  "filename": "common-1.999.999.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-12T19:30:04.557403547Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/@coopeuch/common/v/1.999.999",
        "https://github.com/advisories/GHSA-5h58-475h-6287"
      ],
      "provider_metadata": {
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021433",
            "sha256": "887c41c0805d7d223c499e702796cf46727b0be152b7c8a65607907afb3b5d59",
            "source": "amazon-inspector",
            "versions": [
              "1.999.999"
            ],
            "import_time": "2026-10-11T14:18:05.240602486Z",
            "modified_time": "2026-10-11T13:58:48Z"
          },
          {
            "id": "GHSA-5h58-475h-6287",
            "ranges": [
              {
                "type": "SEMVER",
                "events": [
                  {
                    "introduced": "0"
                  }
                ]
              }
            ],
            "sha256": "7bb4ede3c2c6108558588512db3e190f0255516a40707bd801219d684b0aaff9",
            "source": "ghsa-malware",
            "import_time": "2026-10-12T19:24:46.899886577Z",
            "modified_time": "2026-10-12T19:07:14Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 306737,
  "published_at": "2026-10-11T13:58:48+00:00"
}