Malicious code in webreader (PyPI)

{
  "id": "0f1e451959dc183c43bd69e66c57a6b2e84e86c3b455903a989a59205fd8278b",
  "url": "https://osv.dev/vulnerability/MAL-2026-17757",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in webreader (PyPI)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: kam193 (165632b7385ab993b6a8aa74c76ff55cc1ef55748c67b5dfabca284bc8ced087) In this campaign, the main package (webreader) has an embeded pickle disguised as a config. A related dependency (pafer) contains code to load the pickle. During unpickling, malicious code embeded in the pickle file is automatically executed. It then establishes persistence via a PTH file and downloads the next stage payload. It finally acts like a RAT, allowing remote exfiltration and code execution. --- Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-10-webreader Reasons (based on the campaign): - rat - Downloads and executes a remote malicious script. - obfuscation - The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine. - abuses-pth - persistence - The malicious code is intentionally included in a dependency of the package - files-exfiltration",
    "evidence": "osv:MAL-2026-17757",
    "products": [
      {
        "name": {
          "value": "webreader",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.3.8",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17757",
      "aliases": [
        "MAL-2026-17757"
      ],
      "affected": [
        {
          "package": {
            "name": "webreader",
            "purl": "pkg:pypi/webreader",
            "ecosystem": "PyPI"
          },
          "versions": [
            "2.3.8"
          ],
          "database_specific": {
            "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/webreader/MAL-2026-17757.json"
          }
        }
      ],
      "modified": "2026-10-20T14:30:03.715875505Z",
      "provider": "osv",
      "references": [
        "https://bad-packages.kam193.eu/pypi/package/webreader"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://api.npoint.io/40e32d283a9d97e59252/a"
          ],
          "domains": [
            "frjmzbjbhwvtdnsuodmu.supabase.co"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "pypi/2026-10-webreader/webreader",
            "sha256": "165632b7385ab993b6a8aa74c76ff55cc1ef55748c67b5dfabca284bc8ced087",
            "source": "kam193",
            "versions": [
              "2.3.8"
            ],
            "import_time": "2026-10-10T11:40:44.044652644Z",
            "modified_time": "2026-10-10T11:07:02.763324Z"
          },
          {
            "id": "pypi/2026-10-webreader/webreader",
            "sha256": "9a6899ef4008e014cbfd019b0110720f1968698d9ecfdf603f7e54e864bfdfdd",
            "source": "kam193",
            "versions": [
              "2.3.8"
            ],
            "import_time": "2026-10-20T14:18:32.002920669Z",
            "modified_time": "2026-10-10T11:07:02.763324Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 389091,
  "published_at": "2026-10-10T11:07:02+00:00"
}