concurrent-ruby Known Vulnerabilities & Fixes
concurrent-ruby has 3 known security vulnerabilities in RubyGems (Ruby). Upgrade to version 1.3.7 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: 1.3.7
Upgrading to 1.3.7 or later resolves all 3 known vulnerabilities in concurrent-ruby. Run: gem install concurrent-ruby -v 1.3.7
Is concurrent-ruby in your project?
Check if you're affected and upgrade to 1.3.7 to stay secure.
Security Summary
- 3 affected version ranges have been identified across these 3 advisories.
- 100% of known issues have a published fixed version.
- Remediation: gem update concurrent-ruby
Vulnerabilities
3 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details.
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2026-54904 Concurrent Ruby : `AtomicReference#update` livelocks when the stored value is `Float::NAN` | HIGH | 0.0.1, 0.1.0, 0.1.1, 0.1.1.pre.1 (+73 more) | 1.3.7 |
| CVE-2026-54906 Concurrent Ruby: ReadWriteLock allows wrong-thread write release and stray read-release counter corruption | LOW | 0.0.1, 0.1.0, 0.1.1, 0.1.1.pre.1 (+73 more) | 1.3.7 |
| CVE-2026-54905 Concurrent Ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity | LOW | 0.0.1, 0.1.0, 0.1.1, 0.1.1.pre.1 (+73 more) | 1.3.7 |
About This Data
Vulnerability data for concurrent-ruby 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.
Check Your Dependencies
Scan your project to check if you're using a vulnerable version of concurrent-ruby.