Race condition in HackerOne private_address_check ruby gem
Priority LOW 19CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.
Why it matters now
EPSS 0.0068 52nd percentileScored 2026-11-07
Fix Fixed private_address_check (RubyGems): 0.5.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HackerOne | private_address_check ruby gem | 0.5.0 | — | No fix listed | CNA |
| — | private_address_check (RubyGems) | before 0.5.0 | 0.5.0 | Patch available | GHSA-2xvj-j3qh-x8c3 |
- private_address_check ruby gem VendorHackerOne Affected 0.5.0 Fixed in — No fix listed CNA
- private_address_check (RubyGems) Vendor— Affected before 0.5.0 Fixed in 0.5.0 Patch available GHSA-2xvj-j3qh-x8c3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:ruby:*:* | before 0.5.0 | Vulnerable | Private Address Check Project |
- cpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:ruby:*:* Versions before 0.5.0 Vulnerable ·Private Address Check Project
Remediation
- Fix · GHSA-2xvj-j3qh-x8c3 private_address_check (RubyGems) Fixed in 0.5.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-3759
- 2026-10-03 Alias added: GHSA-2xvj-j3qh-x8c3
References
Patch 1
Advisory 2
More Private Address Check Project Private Address Check vulnerabilities
- TI-2017-00856 The private_address_check ruby gem before 0.4.1 is vulnerable to a bypass due to an… CVSS 3.0CRITICAL 9.8
- TI-2017-00852 Improper handling of exceptional conditions in jtdowney private_address_check ruby gem CVSS 3.0HIGH 8.1
Sources
- CVE-2018-3759 · CVE Program
- CVE-2018-3759 · NVD
- FIRST EPSS
- GHSA-2xvj-j3qh-x8c3 · GitHub Advisory Database · CC BY 4.0
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