CVE-2026-84809

MEDIUM 6.5

Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-693
Vendor	tencent
Product	ai-infra-guard
Published	Sep 2, 2026
Last Updated	Sep 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Tencent / AI-Infra-Guard

0 < 4.5.2 4.6.0 ≤ 4.6.0

Tencent / aig-skill-scan

0 ≤ 0.2.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

nedlir