---
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: 0.44955
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-04T02:48:03.204497Z'
ingestedAt: '2026-09-24T15:45:56.690Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.