{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.6.0"
              },
              {
                "last_affected": "4.6.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "e8931cc68001b66ad024fd87ef07394e9e96524a"
            },
            {
              "fixed": "7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04"
            }
          ],
          "repo": "https://github.com/tencent/ai-infra-guard",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.6.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-693"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84809.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "4.5.2"
          },
          {
            "last_affected": "0.2.1"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Tencent AI-Infra-Guard's skill-scan component excludes compiled Python bytecode files from analysis by hardcoding __pycache__ directories and .pyc/.pyo/.pyd extensions into skip lists across multiple scanning surfaces. Attackers can distribute skills with benign Python source files alongside malicious compiled bytecode that executes on import while the scanner reports a safe verdict, enabling code execution when operators install the skill.",
  "id": "CVE-2026-84809",
  "modified": "2026-09-05T03:30:22.636809111Z",
  "published": "2026-09-02T16:59:48.800Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://pypi.org"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84809.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84809"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Tencent/AI-Infra-Guard/issues/531"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Tencent/AI-Infra-Guard"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode"
}