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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00315.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Tencent AI-Infra-Guard unaffected
Version Status Constraints
0 affected < 4.5.2
4.6.0 affected ≤ 4.6.0
Tencent aig-skill-scan unaffected
Version Status Constraints
0 affected ≤ 0.2.1

No data.

No data.

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Wed, 02 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Title Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode
First Time appeared Tencent
Tencent ai-infra-guard
Weaknesses CWE-693
CPEs cpe:2.3:a:tencent:ai-infra-guard:*:*:*:*:*:*:*:*
cpe:2.3:a:tencent:ai-infra-guard:4.6.0:*:*:*:*:*:*:*
Vendors & Products Tencent
Tencent ai-infra-guard
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 7.1, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-02T16:59:48.800Z

Reserved: 2026-09-02T10:19:32.992Z

Link: CVE-2026-84809

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-02T17:18:05.150

Modified: 2026-09-02T17:18:05.150

Link: CVE-2026-84809

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T11:30:03Z

Weaknesses