CVE-2026-84809 Details
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.
A vulnerability in Tencent AI-Infra-Guard's skill-scan component allows for the execution of malicious Python bytecode. This issue arises because the scanner excludes compiled bytecode files from analysis by default, creating a blind spot for harmful code. Attackers can exploit this by including malicious bytecode in skills, which executes upon import while the scanner indicates a safe status. This vulnerability affects AI-Infra-Guard versions 4.6.0 and prior, as well as the aig-skill-scan tool up to version 0.2.1.
Users can manually inspect and audit skills for malicious bytecode before installation. Additionally, keeping AI-Infra-Guard updated to version 4.6.2 or later, where this issue has been addressed, is recommended.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 2, 2026CISA-ADP
Assessed Sep 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Tencent/AI-Infra-Guard/issues/531 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/Tencent/AI-Infra-Guard | [email protected] | Vendor |
| https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py | [email protected] | Source CodeVendor |
| https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py | [email protected] | Source CodeVendor |
| https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04 | [email protected] | Source CodeVendor |
| https://github.com/Tencent/AI-Infra-Guard/issues/531 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-693 | Protection Mechanism Failure | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Tencent AI-Infra-Guard | >= 0, < 4.5.2 >= 4.6.0, <= 4.6.0 (semver) |
CPE
Remediation
| |
| Tencent aig-skill-scan | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | CVE Modified | CISA-ADP |
| Sep 2, 2026 | New CVE Received | [email protected] |