mal-2026-10183
Vulnerability from ossf_malicious_packages
Published
2026-07-10 22:43
Modified
2026-07-20 13:16
Summary
Malicious code in fkext-browser-min (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (1e56088bc1216133ce76ad6026b73c2fd6977f9c64ec1c2ab38234dc90403b2c)

The package runs vishu.js as a preinstall lifecycle hook on npm install. That script fetches the machine's public IP from api.ipify.org, collects os.hostname() and GitHub Actions / CI environment variables (GITHUB_*), and transmits them as query parameters to a hardcoded webhook.site collector URL over HTTPS. It additionally performs a DNS lookup of a subdomain of the form ping-<hostname>.<collaborator>.oastify.com, providing an out-of-band exfiltration channel (Burp Collaborator style) that bypasses HTTP egress filters. There is no legitimate functionality shipped alongside this — the package's only install-time effect is host reconnaissance and beacon-out to attacker-controlled sinks. This is a dependency-confusion / bug-bounty-style beacon against installer/CI environments.

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits

{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          }
        ],
        "indicators": {
          "evidence_files": [
            {
              "path": "vishu.js",
              "sha256": "148b5be8544f83525c7442f450050b49d7bb467ee17d3b5df9d23c4f39663f8c",
              "tlsh": "7831104db2f7551004f263c8561b951e715be1533325dda1799c02521faad3c82e3bd8"
            }
          ],
          "package_integrity": [
            {
              "filename": "fkext-browser-min-1.0.14.tgz",
              "hashes": {
                "sha1": "956d600ab58369d4f8abe1eb7b363df2092d4b65",
                "sha512_sri": "sha512-F5c2Lb6QIXFu+3ldBEdQ3gOZ9b+aOHDYbx8cXRSCgQAmPyrNjZRoHMHL7ZOJY+CeS20rE+Z4rFKAbE+U4hNAWg=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "fkext-browser-min"
      },
      "versions": [
        "1.0.14"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    },
    {
      "contact": [
        "https://www.reversinglabs.com"
      ],
      "name": "ReversingLabs",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-009728",
        "import_time": "2026-07-10T22:50:19.244634627Z",
        "modified_time": "2026-07-10T22:43:30Z",
        "sha256": "1e56088bc1216133ce76ad6026b73c2fd6977f9c64ec1c2ab38234dc90403b2c",
        "source": "amazon-inspector",
        "versions": [
          "1.0.14"
        ]
      },
      {
        "id": "RLMA-2026-05540",
        "import_time": "2026-07-20T13:14:46.361202314Z",
        "modified_time": "2026-07-20T10:43:39Z",
        "sha256": "34c36db539a94663e23abbab6291033237a0f58136fb2f46e59f77cb39a00cd0",
        "source": "reversing-labs",
        "versions": [
          "1.0.14"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (1e56088bc1216133ce76ad6026b73c2fd6977f9c64ec1c2ab38234dc90403b2c)\nThe package runs vishu.js as a preinstall lifecycle hook on `npm install`. That script fetches the machine\u0027s public IP from api.ipify.org, collects os.hostname() and GitHub Actions / CI environment variables (GITHUB_*), and transmits them as query parameters to a hardcoded webhook.site collector URL over HTTPS. It additionally performs a DNS lookup of a subdomain of the form `ping-\u003chostname\u003e.\u003ccollaborator\u003e.oastify.com`, providing an out-of-band exfiltration channel (Burp Collaborator style) that bypasses HTTP egress filters. There is no legitimate functionality shipped alongside this \u2014 the package\u0027s only install-time effect is host reconnaissance and beacon-out to attacker-controlled sinks. This is a dependency-confusion / bug-bounty-style beacon against installer/CI environments.\n",
  "id": "MAL-2026-10183",
  "modified": "2026-07-20T13:16:56Z",
  "published": "2026-07-10T22:43:30Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/fkext-browser-min/v/1.0.14"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in fkext-browser-min (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

Author Source Type Date Other

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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Detection rules are retrieved from Rulezet.

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