{"id":"CVE-2026-84809","title":"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","summary":"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 dist…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cwe":["CWE-693"],"vendor":"Tencent","product":"AI-Infra-Guard","affected":["AI-Infra-Guard < 4.5.2","AI-Infra-Guard >= 4.6.0 <= 4.6.0","aig-skill-scan <= 0.2.1"],"published":"2026-09-02","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:43:32.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84809","references":[{"url":"https://github.com/Tencent/AI-Infra-Guard","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Tencent/AI-Infra-Guard/issues/531","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Tencent/AI-Infra-Guard/issues/531","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00572,"epssPercentile":0.44879,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-04T02:48:03.204497Z"},"ingestedAt":"2026-09-24T15:45:56.690Z","slug":"CVE-2026-84809","body":"## Overview\n\nTencent 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}