Answer in brief
CVE-2020-8184 records a High severity (CVSS 7.5) vulnerability in Rack allows Percent-encoded cookies to overwrite existing prefixed cookie names. The current sources do not mark it as known exploited. The current feed maps rack (rubygems), rack (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rack (rubygems), rack (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rackrubygems | >=0 <2.1.4 | 2.1.4 |
| rackrubygems | >=2.2.0 <2.2.3 | 2.2.3 |
Published upstream
Jun 24, 2020
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it possible for an attacker to forge a secure or host-only cookie prefix.
Quoted source text, attributed separately from HOL analysis.