mal-2026-17437
Vulnerability from ossf_malicious_packages
Published
2026-10-01 02:40
Modified
2026-10-01 05:56
Summary
Malicious code in @bluewin/utils (npm)
Details

@bluewin/utils is a dependency-confusion package: it describes itself as a "PoC package for dependency confusion testing" and claims the @bluewin scope, so a build that resolves that scope from the public registry runs its code instead of the intended private package. Its postinstall script runs node postinstall.js on npm install, which sends an HTTPS request to https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils, a Burp Collaborator endpoint, disclosing the installing host's IP address and that it installed the package. It collects no further data, but unreviewed code from an outside publisher has run with the installing user's privileges. The npm account securityresearch1 published it on 2026-10-01.

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits
InvisiRisk, Inc. www.invisirisk.com mailto:research@invisirisk.com
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          }
        ]
      },
      "package": {
        "ecosystem": "npm",
        "name": "@bluewin/utils"
      },
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "https://www.invisirisk.com",
        "mailto:research@invisirisk.com"
      ],
      "name": "InvisiRisk, Inc.",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "iocs": {
      "domains": [
        "5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com"
      ],
      "files": [
        {
          "digests": {
            "sha256": "628e04ce4e3165269e4505b10af93a2df7f689fad6bcbf49409d7be7e18bf300"
          },
          "note": "postinstall script: node postinstall.js",
          "paths": [
            "package.json"
          ],
          "source": "PACKAGE_ARCHIVE"
        },
        {
          "digests": {
            "sha256": "68324659e177d6de76125da39ab3ca96e27a9d3890692a12a652c18471163770"
          },
          "note": "Executed by the postinstall script of @bluewin/utils@1.0.0.",
          "paths": [
            "postinstall.js"
          ],
          "source": "PACKAGE_ARCHIVE"
        }
      ],
      "urls": [
        "https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils"
      ]
    }
  },
  "details": "@bluewin/utils is a dependency-confusion package: it describes itself as a \"PoC package for dependency confusion testing\" and claims the `@bluewin` scope, so a build that resolves that scope from the public registry runs its code instead of the intended private package. Its postinstall script runs `node postinstall.js` on npm install, which sends an HTTPS request to `https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils`, a Burp Collaborator endpoint, disclosing the installing host\u0027s IP address and that it installed the package. It collects no further data, but unreviewed code from an outside publisher has run with the installing user\u0027s privileges. The npm account securityresearch1 published it on 2026-10-01.",
  "id": "MAL-2026-17437",
  "modified": "2026-10-01T05:56:26Z",
  "published": "2026-10-01T02:40:08Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@bluewin/utils"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in @bluewin/utils (npm)"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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