# CVE-2026-84811: agentverus-scanner Companion Code Analysis Bypass via Excluded Python Bytecode

> Attackers bypass security scanning by hiding malicious Python bytecode in excluded directories, enabling arbitrary code execution while receiving a certified verdict.

- **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-7r9q-g8p5-w7pp

## What is CVE-2026-84811?

CVE-2026-84811 is a high-severity vulnerability in agentverus-scanner, 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

agentverus-scanner fails to analyze compiled Python bytecode files in companion code directories, allowing attackers to bypass security scanning by shipping malicious __pycache__ entries alongside benign source files. Attackers can execute arbitrary Python bytecode on import while the scanner reports a CERTIFIED verdict with high trust scores in both static and semantic analysis modes.

Weakness: CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2026-84811?


## How do I fix CVE-2026-84811?

No fix has been published for CVE-2026-84811 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-84811 being exploited?

There is no known exploitation of CVE-2026-84811 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84811 and fix it if it is affected.

What it is: CVE-2026-84811 is a high-severity vulnerability in agentverus-scanner, 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: There is no known exploitation of CVE-2026-84811 in the wild and no public exploit code.

Affected product: agentverus-scanner. 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-2026-84811/ (Markdown: https://insights.sbomify.com/CVE-2026-84811/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84811
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84811
- OSV: https://osv.dev/vulnerability/CVE-2026-84811

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84811/
Summaries are generated and may contain mistakes; the official description above is the record.