Malicious code in simplewave (npm)

{
  "id": "d8db349ee20e00cf6cc8b1b819069bb70ff1e2e58434d137e992d14b038d283e",
  "url": "https://osv.dev/vulnerability/MAL-2026-18187",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in simplewave (npm)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (d984cf27dec602e96199a4361b485f0a7c79e2134977a355d42ddb46edd606d0) simplewave@0.0.2 declares a postinstall script in package.json that runs an inline Node command performing an HTTP GET to a subdomain of oast.fun with the installer's os.hostname() embedded as the leftmost DNS label. oast.fun is the public Interactsh out-of-band interaction server, used to receive exfiltrated data via DNS/HTTP callbacks. The beacon fires unconditionally on npm install, with no caller consent or configuration. The shipped index.js is a trivial stub providing no advertised functionality, so the manifest-level beacon is the package's entire effect. The host identifier of every machine that installs the package is delivered to a third-party OOB collector controlled by whoever provisioned the oast.fun subdomain token.",
    "evidence": "osv:MAL-2026-18187",
    "products": [
      {
        "name": {
          "value": "simplewave",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.0.2",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-18187",
      "aliases": [
        "MAL-2026-18187"
      ],
      "affected": [
        {
          "package": {
            "name": "simplewave",
            "purl": "pkg:npm/simplewave",
            "ecosystem": "npm"
          },
          "versions": [
            "0.0.2"
          ],
          "database_specific": {
            "cwes": [
              {
                "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/simplewave/MAL-2026-18187.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "package.json",
                  "tlsh": "4ce02df80f80db3b60c40ee406a78026f323c80200042a00e3fb11aa02d82f20c3e48c",
                  "sha256": "e8471246cd57d1305b12c3523851f05178e56bbd2d2ab43c181179308b66d643"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "5a97802b03f92a9f0fb4dcce29e11adbd742c174",
                    "sha512_sri": "sha512-evpJRFgOF3WjrXTV1n+6Ad0pKHFnp+kE1BBZErY7voT58oBBhMEtpksG8wi1Doy9uIKzTT1bNcbcHoV+gHACoA=="
                  },
                  "filename": "simplewave-0.0.2.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-22T06:45:05.827762247Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/simplewave/v/0.0.2"
      ],
      "provider_metadata": {
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021566",
            "sha256": "d984cf27dec602e96199a4361b485f0a7c79e2134977a355d42ddb46edd606d0",
            "source": "amazon-inspector",
            "versions": [
              "0.0.2"
            ],
            "import_time": "2026-10-22T06:30:23.52812547Z",
            "modified_time": "2026-10-22T06:10:14Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 404578,
  "published_at": "2026-10-22T06:10:14+00:00"
}