Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious…
Priority MEDIUM 43Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious third-party site to perform CORS requests. If the configuration were intended to allow only the trusted example.com domain name and not the malicious example.net domain name, then example.com.example.net (as well as example.com-example.net) would be inadvertently allowed.
Why it matters now
EPSS 0.02345 83rd percentileScored 2026-11-07
Fix Fixed rack-cors (RubyGems): 0.4.1
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | rack-cors (RubyGems) | before 0.4.1 | 0.4.1 | Patch available | GHSA-2j9c-9vmv-7m39 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- rack-cors (RubyGems) Vendor— Affected before 0.4.1 Fixed in 0.4.1 Patch available GHSA-2j9c-9vmv-7m39
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rack-cors_project:rack-cors:*:*:*:*:*:ruby:*:* | before 0.4.1 | Vulnerable | Rack-cors Project |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:rack-cors_project:rack-cors:*:*:*:*:*:ruby:*:* Versions before 0.4.1 Vulnerable ·Rack-cors Project
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
- Fix · GHSA-2j9c-9vmv-7m39 rack-cors (RubyGems) Fixed in 0.4.1 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2017-11173
- 2026-10-03 Alias added: GHSA-2j9c-9vmv-7m39
References
Advisory 4
Sources
- CVE-2017-11173 · CVE Program
- CVE-2017-11173 · NVD
- FIRST EPSS
- GHSA-2j9c-9vmv-7m39 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-11173 · Red Hat security data · CC BY 4.0
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