Vulnerability in Tencent Aig-Skill-Scan
CVE-2026-84809
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/Tencent/AI-Infra-Guard/issues/531 (issue-tracking)
- github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb… (patch)
- github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/d… (technical-description)
- github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_s… (technical-description)
- github.com/Tencent/AI-Infra-Guard (product)
- www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84809?
- CVE-2026-84809 is a medium-severity vulnerability in Tencent Aig-Skill-Scan, classified under Protection Mechanism Failure. CVSS score: 6.5/10. Published 2026-09-02.
- How severe is CVE-2026-84809?
- Medium severity. CVSS v3 base score is 6.5 out of 10.