# CVE-2026-84809

## Summary

- **CVE ID:** CVE-2026-84809
- **Severity:** HIGH
- **CVSS Score:** 7.1 (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)
- **CWE:** CWE-693
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 4, 2026

## Description

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.

## Affected Products

- Tencent — AI-Infra-Guard (0)
- Tencent — AI-Infra-Guard (4.6.0)
- Tencent — aig-skill-scan (0)

## References

- [CNA](https://github.com/Tencent/AI-Infra-Guard/issues/531)
- [CNA](https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04)
- [CNA](https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py)
- [CNA](https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py)
- [CNA](https://github.com/Tencent/AI-Infra-Guard)
- [CNA](https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._