Malicious code in @coopeuch/config (npm)

{
  "id": "46f5f072d56951fca1a824530b30a826ed7d879964e2f3833f58f2c734d3d8ac",
  "url": "https://osv.dev/vulnerability/MAL-2026-17762",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in @coopeuch/config (npm)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (0c9b2c76aac3e901d6585717a7e1f9729699bf3a4e280eb20a68bcef4d507d0d) The package publishes to the @coopeuch npm scope at version 1.999.999 with a stub index.js, a shape designed to win resolution over an internal scope registry when an organization's scope-to-registry mapping is missing. On npm install, scripts.postinstall executes postinstall.js, which collects host identity (hostname, username, uid/gid, homedir, non-internal network interface addresses and MAC addresses, DNS servers, reverse-DNS internal FQDN), CI/orchestration markers, npm context, container detection via /proc/1/cgroup, and the consuming parent package's name, version, and declared version range, then POSTs the aggregated JSON over HTTPS to the hardcoded author endpoint collector.oob.s4yhii.com/_npm-poc/beacon alongside a DNS beacon under *.oob.s4yhii.com. The behavior fires automatically at install time without consent and reveals internal infrastructure details and private project identifiers of any organization whose build resolves this package from the public registry. ## Source: ghsa-malware (7f05545d655ec4766414a523d3cf4dc6671cf72c67aefe8dd832dd59081bd23b) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the compute",
    "evidence": "osv:MAL-2026-17762",
    "products": [
      {
        "name": {
          "value": "@coopeuch/config",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.999.999",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17762",
      "aliases": [
        "GHSA-5w9x-2gg7-px58",
        "MAL-2026-17762"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "@coopeuch/config",
            "purl": "pkg:npm/%40coopeuch/config",
            "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/config/MAL-2026-17762.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "postinstall.js",
                  "tlsh": "0ae1fa6a05fe1132226235f4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed",
                  "sha256": "c859191e9d7e04d59b5d2f566799feb31594a68573350bd17661be469e8663ef"
                },
                {
                  "path": "package.json",
                  "tlsh": "6be0e53085214f33a4d419a90d372545509a295347083c1463e7426c4b9c77a88ff32d",
                  "sha256": "4ca94fd65701e7bf32fc00c7c1fdd1336b139f8c2dc66d249be83cf3877df659"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "79c25e547363f0f616d9a572cc246b0df84be318",
                    "sha512_sri": "sha512-LjhqpLTjaqIy40i0+L42YJ4LrS7TmGITT0w7PTj0eN3f1pGv00MhnEZ0dMzmAjoMTzOhaizWzCsKy3JoXFPPvw=="
                  },
                  "filename": "config-1.999.999.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-12T19:30:04.552523687Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/@coopeuch/config/v/1.999.999",
        "https://github.com/advisories/GHSA-5w9x-2gg7-px58"
      ],
      "provider_metadata": {
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021382",
            "sha256": "0c9b2c76aac3e901d6585717a7e1f9729699bf3a4e280eb20a68bcef4d507d0d",
            "source": "amazon-inspector",
            "versions": [
              "1.999.999"
            ],
            "import_time": "2026-10-11T14:18:01.035704786Z",
            "modified_time": "2026-10-11T13:51:00Z"
          },
          {
            "id": "GHSA-5w9x-2gg7-px58",
            "ranges": [
              {
                "type": "SEMVER",
                "events": [
                  {
                    "introduced": "0"
                  }
                ]
              }
            ],
            "sha256": "7f05545d655ec4766414a523d3cf4dc6671cf72c67aefe8dd832dd59081bd23b",
            "source": "ghsa-malware",
            "import_time": "2026-10-12T19:24:46.902055438Z",
            "modified_time": "2026-10-12T19:07:20Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 306736,
  "published_at": "2026-10-11T13:51:00+00:00"
}