puma Security Analysis
puma has 11 known security vulnerabilities in RubyGems (Ruby). Upgrade to version 8.0.2 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 8.0.2
Upgrading to 8.0.2 or later resolves all 11 known vulnerabilities in puma. Run: gem install puma -v 8.0.2
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Vulnerabilities
11 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details.
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2023-40175 Puma HTTP Request/Response Smuggling vulnerability | CRITICAL | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+157 more) | 5.6.7, 6.3.1 |
| CVE-2022-24790 Puma vulnerable to HTTP Request Smuggling | CRITICAL | 5.0.0, 5.0.1, 5.0.2, 5.0.3 (+142 more) | 5.6.4, 4.3.12 |
| CVE-2026-47737 Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections | HIGH | 8.0.0, 8.0.1, 5.5.0, 5.5.1 (+35 more) | 8.0.2, 7.2.1 |
| CVE-2026-47736 Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustion | HIGH | 8.0.0, 8.0.1, 5.5.0, 5.5.1 (+35 more) | 8.0.2, 7.2.1 |
| CVE-2022-23634 Puma used with Rails may lead to Information Exposure | HIGH | 5.0.0, 5.0.1, 5.0.2, 5.0.3 (+140 more) | 5.6.2, 4.3.11 |
| CVE-2021-29509 Puma's Keepalive Connections Causing Denial Of Service | HIGH | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+129 more) | 4.3.8, 5.3.1 |
| CVE-2020-11076 HTTP Smuggling via Transfer-Encoding Header in Puma | HIGH | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+112 more) | 3.12.5, 4.3.4 |
| CVE-2024-21647 Puma HTTP Request/Response Smuggling vulnerability | MEDIUM | 6.0.0, 6.0.1, 6.0.2, 6.1.0 (+161 more) | 6.4.2, 5.6.8 |
| CVE-2020-11077 HTTP Smuggling via Transfer-Encoding Header in Puma | MEDIUM | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+114 more) | 3.12.6, 4.3.5 |
| CVE-2024-45614 Puma's header normalization allows for client to clobber proxy set headers | MEDIUM | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+163 more) | 5.6.9, 6.4.3 |
| CVE-2020-5249 HTTP Response Splitting (Early Hints) in Puma | MEDIUM | 0.8.0, 0.8.1, 0.8.2, 0.9.0 (+110 more) | 3.12.4, 4.3.3 |
About This Data
Vulnerability data for puma is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related RubyGems (Ruby) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
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