What’s Vulnerable › Vulnerabilities

CVE-2026-84809: Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-24
• Weakness: CWE-693

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: before 4.5.2; from 4.6.0 through 4.6.0 — fixed in 4.5.2
• Tencent aig-skill-scan: through 0.2.1

How to fix

Upgrade to a fixed version: Tencent AI-Infra-Guard 4.5.2. Check the vendor advisory for mitigations.

References

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

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