Wrap-around Error Affecting concurrent-ruby package, versions <1.3.7
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RUBY-CONCURRENTRUBY-17391434
- published21 Jun 2026
- disclosed19 Jun 2026
- creditPranjali Thakur
Introduced: 19 Jun 2026
NewCVE-2026-54905 (opens in a new tab)How to fix?
Upgrade concurrent-ruby to version 1.3.7 or higher.
Overview
Affected versions of this package are vulnerable to Wrap-around Error in ReentrantReadWriteLock that causes incorrect write locks. An attacker can cause a thread to incorrectly obtain a write lock without exclusivity by repeatedly acquiring the read lock 32,768 times, which overflows the internal counter and bypasses the global writer state. This allows other threads to continue acquiring read locks concurrently, leading to data races and inconsistent reads of shared mutable state.