Uncontrolled resource consumption in Rack
Priority LOW 37CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 fixed, 1 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.
Summary
There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6. Specially crafted requests can cause the multipart parser to enter a pathological state, causing the parser to use CPU resources disproportionate to the request size.
Why it matters now
EPSS 0.02033 81st percentileScored 2026-11-07
Fix Partial rack (RubyGems): 2.0.6Red Hat: 1 advisoryRed Hat: 2 fixed, 1 without a fix
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 |
|---|---|---|---|---|---|
| rack | Rack | 2.0.6 | — | No fix listed | CNA |
| — | rack (RubyGems) | 2.0.4 to before 2.0.6 | 2.0.6 | Patch available | GHSA-hg78-4f6x-99wq |
- Rack Vendorrack Affected 2.0.6 Fixed in — No fix listed CNA
- rack (RubyGems) Vendor— Affected 2.0.4 to before 2.0.6 Fixed in 2.0.6 Patch available GHSA-hg78-4f6x-99wq
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rack_project:rack:2.0.4:*:*:*:*:*:*:* | 2.0.4 | Vulnerable | Rack Project |
| cpe:2.3:a:rack_project:rack:2.0.5:*:*:*:*:*:*:* | 2.0.5 | Vulnerable | Rack Project |
- cpe:2.3:a:rack_project:rack:2.0.4:*:*:*:*:*:*:* Versions 2.0.4 Vulnerable ·Rack Project
- cpe:2.3:a:rack_project:rack:2.0.5:*:*:*:*:*:*:* Versions 2.0.5 Vulnerable ·Rack Project
Remediation
- Fix · GHSA-hg78-4f6x-99wq rack (RubyGems) Fixed in 2.0.6 Advisory →
Red Hat 1 advisory
- RHSA-2019:3172 Released 2019-10-22 · Red Hat rating ModerateRed Hat Satellite 6 security, bug fix, and enhancement update
- Red Hat Satellite 6.6 ansible-runner-1.3.4-2.el7ar, ansiblerole-foreman_scap_client-0.0.3-1.el7sat, ansiblerole-insights-client-1.6-2.el7sat +47
- Red Hat Satellite Capsule 6.6 ansible-runner-1.3.4-2.el7ar, ansiblerole-foreman_scap_client-0.0.3-1.el7sat, ansiblerole-insights-client-1.6-2.el7sat +47
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Satellite 6 | Affected | No fix planned: Will not fix |
| Red Hat Satellite 6.6 | Fixed | RHSA-2019:3172 |
| Red Hat Satellite Capsule 6.6 | Fixed | RHSA-2019:3172 |
Not affected: 15 products
- CloudForms Management Engine 5
- Red Hat OpenShift Container Platform 3.2
- Red Hat OpenShift Container Platform 3.3
- Red Hat OpenShift Container Platform 3.4
- Red Hat OpenShift Enterprise 3.1
- Red Hat OpenStack Platform 10 (Newton) Operational Tools
- Red Hat OpenStack Platform 12 (Pike) Operational Tools
- Red Hat OpenStack Platform 13 (Queens) Operational Tools
- Red Hat OpenStack Platform 14 (Rocky) Operational Tools
- Red Hat OpenStack Platform 8 (Liberty) Operational Tools
- Red Hat OpenStack Platform 9 (Mitaka) Operational Tools
- Red Hat Software Collections
- Red Hat Storage 3
- Red Hat Subscription Asset Manager
- Red Hat Update Infrastructure 3 for Cloud Providers
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16470
- 2026-10-03 Alias added: GHSA-hg78-4f6x-99wq
References
Other 5
- https://groups.google.com/forum/#%21msg/rubyonrails-security/U_x-YkfuVTg/xhvYAmp6AAAJ
- https://github.com/rack/rack
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2018-16470.yml
- https://groups.google.com/forum/#!msg/rubyonrails-security/U_x-YkfuVTg/xhvYAmp6AAAJ
- https://groups.google.com/forum/#!topic/ruby-security-ann/Dz4sRl-ktKk
More rack vulnerabilities
- TI-2024-23301 rack-contrib vulnerable to Denial of Service due to the unconstrained value of the incoming "profiler_runs" parameter CVSS 3.1HIGH 8.6
- TI-2024-16580 Rack ReDos in content type parsing (2nd degree polynomial) CVSS 3.1HIGH 7.5
- TI-2026-28312 Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization CVSS 4.0CRITICAL 9.3
- TI-2024-17236 Possible Denial of Service Vulnerability in Rack Header Parsing CVSS 3.1HIGH 7.5
- TI-2024-17231 Possible DoS Vulnerability with Range Header in Rack CVSS 3.1HIGH 7.5
- TI-2023-12254 Uncontrolled resource consumption in https://github.com/rack/rack CVSS 3.1HIGH 7.5
Sources
- CVE-2018-16470 · CVE Program
- CVE-2018-16470 · NVD
- FIRST EPSS
- GHSA-hg78-4f6x-99wq · GitHub Advisory Database · CC BY 4.0
- CVE-2018-16470 · Red Hat security data · CC BY 4.0
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