Malicious code in aseitylab (PyPI)

{
  "id": "82c8761a55e5049d5aa6edf909e3acedcc8314c1d34813bdefc28b231749d9aa",
  "url": "https://osv.dev/vulnerability/MAL-2026-17240",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in aseitylab (PyPI)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (9b47f0f7a0776cad3d4c83604d35a0023a250d2f035e58129233095aa2b110a3) aseitylab/_shimdata.py contains a large base85-encoded, zlib-compressed blob stored as DATA. aseitylab/compat.py defines _ensure_compat(), which base85-decodes and zlib-inflates DATA and passes the result to exec(compile(..., '', 'exec')). setup.py imports aseitylab.compat and invokes _ensure_compat() during package build/install, and aseitylab/__init__.py calls the same function on every import, so the decoded payload runs both when the package is installed and whenever it is imported. Execution is gated by environment variables (ASEITYLAB_COMPAT=0, DAS_STAGED=1) that allow the payload to be suppressed in build or test environments. The README advertises a pure-Python task-orchestration toolkit with no runtime dependencies, which does not require a compressed, encoded executable blob shipped as 'compatibility shim data'. MANIFEST.in additionally excludes file names (loader_payload.py, make_armed.py, armed.json, manifest.benign.json) consistent with a build harness that produces separate 'armed' and 'benign' tarballs. The contents of the executed payload are not inspectable from the shipped source; installing or importing the package hands arbitrary code execution to whatever DATA decodes to. ## Source: kam193 (24b99c2059065cbe44f7dac2f1d2878b237c58150c0890baa1856852e76fcb24) During installation, obfuscated code is used to ",
    "evidence": "osv:MAL-2026-17240",
    "products": [
      {
        "name": {
          "value": "aseitylab",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.1.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.1.1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17240",
      "aliases": [
        "MAL-2026-17240"
      ],
      "affected": [
        {
          "package": {
            "name": "aseitylab",
            "purl": "pkg:pypi/aseitylab",
            "ecosystem": "PyPI"
          },
          "versions": [
            "0.1.0",
            "0.1.1"
          ],
          "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/pypi/aseitylab/MAL-2026-17240.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "aseitylab/compat.py",
                  "tlsh": "e6019c606d4d1cb2e230b06e8964e4bcc26d5b07be266006bd8c47bc2f30f51d2e28dc",
                  "sha256": "67a8e98c2d83e13097bf6138c7ca7bc388830df888ec12bc56438859e7adb20b"
                },
                {
                  "path": "aseitylab/_shimdata.py",
                  "tlsh": "ad31fab54d504edae1ac134423302cfeed221e3d4be69675f9d048d2166e0548550aff",
                  "sha256": "aad65af02297f9594503919fb08845ade61092e9116f314c813ced6d9ca266a2"
                },
                {
                  "path": "MANIFEST.in",
                  "tlsh": "7fc02230865cb056820d04ea2e609e14a19a2e073aa36313c6090cedec0b5c8d0176aa",
                  "sha256": "9f2f4b9007fbab4bf4176ae67d7b3787493575da533a3e0d35a0f6e045ee9c32"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-25T23:45:03.268046508Z",
      "provider": "osv",
      "references": [
        "https://www.virustotal.com/gui/file/d03c42c275f0dbc617428441508c49ae1adcbbc95af4eeb094bca4e4f8943f3e/detection",
        "https://polygonscan.com/address/0x9c0a507300fd902787bb193d80fca5ce6e1bff9a",
        "https://bad-packages.kam193.eu/pypi/package/aseitylab",
        "https://pypi.org/project/aseitylab/0.1.0/"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://thisisafalsepositive.st/cdn/v2/9f4e7a2c1b8d.png",
            "https://thisisafalsepositive.st/cdn/v2/promotion/manifest.json"
          ],
          "domains": [
            "thisisafalsepositive.st",
            "sltnnt.ru"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "pypi/2026-09-donutautosellsrc/aseitylab",
            "sha256": "24b99c2059065cbe44f7dac2f1d2878b237c58150c0890baa1856852e76fcb24",
            "source": "kam193",
            "versions": [
              "0.1.0",
              "0.1.1"
            ],
            "import_time": "2026-09-28T22:18:26.131496416Z",
            "modified_time": "2026-09-28T21:24:44.922816Z"
          },
          {
            "id": "IN-MAL-2026-020624",
            "sha256": "9b47f0f7a0776cad3d4c83604d35a0023a250d2f035e58129233095aa2b110a3",
            "source": "amazon-inspector",
            "versions": [
              "0.1.0"
            ],
            "import_time": "2026-09-29T04:22:41.724812405Z",
            "modified_time": "2026-09-29T03:47:52Z"
          },
          {
            "id": "pypi/2026-09-donutautosellsrc/aseitylab",
            "sha256": "7a9abd6aaf665ceab13368a8983572e4df9a895f45b0fee615c2d2a1e82bd0f8",
            "source": "kam193",
            "versions": [
              "0.1.0",
              "0.1.1"
            ],
            "import_time": "2026-10-25T23:38:10.324756452Z",
            "modified_time": "2026-09-28T21:24:44.922816Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 445983,
  "published_at": "2026-09-28T21:24:44+00:00"
}