# CVE-2026-84809: Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode

> Attackers can bypass Tencent AI-Infra-Guard's skill-scan by hiding malicious code in excluded Python bytecode files, leading to code execution upon skill installation.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-7vc4-66f2-3f5f

## What is CVE-2026-84809?

CVE-2026-84809 is a high-severity vulnerability in Tencent AI-Infra-Guard, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2026-84809?


## How do I fix CVE-2026-84809?

No fix has been published for CVE-2026-84809 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-84809 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84809 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84809 and fix it if it is affected.

What it is: CVE-2026-84809 is a high-severity vulnerability in Tencent AI-Infra-Guard, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84809 exists.

Affected product: Tencent AI-Infra-Guard. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-84809/ (Markdown: https://insights.sbomify.com/CVE-2026-84809/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84809
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84809
- OSV: https://osv.dev/vulnerability/CVE-2026-84809

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-84809/
Summaries are generated and may contain mistakes; the official description above is the record.