CVE-2026-84809CWE-693

CVE-2026-84809

Medium · published September 2, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
24.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00315 · 24.0th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-09-02T21:18Z
References (7)
https://github.com/Tencent/AI-Infra-Guard · [email protected]https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py · [email protected]https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py · [email protected]https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04 · [email protected]https://github.com/Tencent/AI-Infra-Guard/issues/531 · [email protected]https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode · [email protected]https://github.com/Tencent/AI-Infra-Guard/issues/531 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 02 SEP 16:59Z
    Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode
    cvelistv5