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Vulnerable Software

Vulnerability Details CVE-2026-54906

concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReadWriteLock#release_write_lock does not verify that the calling thread acquired the write lock. Any thread with access to the lock object can release an active write lock held by another thread. A second writer can then enter its critical section while the first writer is still running. Concurrent::ReadWriteLock#release_read_lock also decrements the shared counter even when no read lock is held. Calling it on a fresh lock changes the counter from 0 to -1, after which normal read acquisition raises Concurrent::ResourceLimitError. This is a synchronization correctness issue in the public Concurrent::ReadWriteLock API. This vulnerability is fixed in 1.3.7.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 5.6%

CVSS Severity

CVSS v3 Score 9.8

References

Products affected by CVE-2026-54906

Rubyconcurrency » Concurrent Ruby » Version: 0.0.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.1
Rubyconcurrency » Concurrent Ruby » Version: 0.0.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.2
Rubyconcurrency » Concurrent Ruby » Version: 0.1.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.0
Rubyconcurrency » Concurrent Ruby » Version: 0.1.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1
Rubyconcurrency » Concurrent Ruby » Version: 0.2.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.0
Rubyconcurrency » Concurrent Ruby » Version: 0.2.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.1
Rubyconcurrency » Concurrent Ruby » Version: 0.2.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.2
Rubyconcurrency » Concurrent Ruby » Version: 0.3.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0
Rubyconcurrency » Concurrent Ruby » Version: 0.3.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1
Rubyconcurrency » Concurrent Ruby » Version: 0.3.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.2
Rubyconcurrency » Concurrent Ruby » Version: 0.4.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.0
Rubyconcurrency » Concurrent Ruby » Version: 0.4.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.1
Rubyconcurrency » Concurrent Ruby » Version: 0.5.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.5.0
Rubyconcurrency » Concurrent Ruby » Version: 0.6.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0
Rubyconcurrency » Concurrent Ruby » Version: 0.6.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.1
Rubyconcurrency » Concurrent Ruby » Version: 0.7.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0
Rubyconcurrency » Concurrent Ruby » Version: 0.7.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.2
Rubyconcurrency » Concurrent Ruby » Version: 0.8.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0
Rubyconcurrency » Concurrent Ruby » Version: 0.9.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0
Rubyconcurrency » Concurrent Ruby » Version: 0.9.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.1
Rubyconcurrency » Concurrent Ruby » Version: 0.9.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.2
Rubyconcurrency » Concurrent Ruby » Version: 1.0.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0
Rubyconcurrency » Concurrent Ruby » Version: 1.0.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.1
Rubyconcurrency » Concurrent Ruby » Version: 1.0.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.2
Rubyconcurrency » Concurrent Ruby » Version: 1.0.3

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3
Rubyconcurrency » Concurrent Ruby » Version: 1.0.4

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.4
Rubyconcurrency » Concurrent Ruby » Version: 1.0.5

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.5
Rubyconcurrency » Concurrent Ruby » Version: 1.1.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0
Rubyconcurrency » Concurrent Ruby » Version: 1.1.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.1
Rubyconcurrency » Concurrent Ruby » Version: 1.1.10

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.10
Rubyconcurrency » Concurrent Ruby » Version: 1.1.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.2
Rubyconcurrency » Concurrent Ruby » Version: 1.1.3

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.3
Rubyconcurrency » Concurrent Ruby » Version: 1.1.4

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.4
Rubyconcurrency » Concurrent Ruby » Version: 1.1.5

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.5
Rubyconcurrency » Concurrent Ruby » Version: 1.1.6

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.6
Rubyconcurrency » Concurrent Ruby » Version: 1.1.7

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.7
Rubyconcurrency » Concurrent Ruby » Version: 1.1.8

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.8
Rubyconcurrency » Concurrent Ruby » Version: 1.1.9

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.9
Rubyconcurrency » Concurrent Ruby » Version: 1.2.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.0
Rubyconcurrency » Concurrent Ruby » Version: 1.2.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.1
Rubyconcurrency » Concurrent Ruby » Version: 1.2.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.2
Rubyconcurrency » Concurrent Ruby » Version: 1.2.3

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.3
Rubyconcurrency » Concurrent Ruby » Version: 1.3.0

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.0
Rubyconcurrency » Concurrent Ruby » Version: 1.3.1

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.1
Rubyconcurrency » Concurrent Ruby » Version: 1.3.2

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.2
Rubyconcurrency » Concurrent Ruby » Version: 1.3.3

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.3
Rubyconcurrency » Concurrent Ruby » Version: 1.3.4

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.4
Rubyconcurrency » Concurrent Ruby » Version: 1.3.5

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.5
Rubyconcurrency » Concurrent Ruby » Version: 1.3.6

cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.6

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-54906

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