{"id":"CVE-2026-84809","summary":"Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode","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.","modified":"2026-09-04T11:30:21.337779086Z","published":"2026-09-02T16:59:48.800Z","database_specific":{"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"}],"cna_assigner":"VulnCheck"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tencent/ai-infra-guard","events":[{"introduced":"e8931cc68001b66ad024fd87ef07394e9e96524a"},{"fixed":"7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"4.6.0"},{"last_affected":"4.6.0"}]}}],"versions":["4.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84809.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}