CVE-2026-54904— ruby-concurrency concurrent-ruby 资源管理错误漏洞

concurrent-ruby: `AtomicReference#update` livelocks when the stored value is `Float::NAN`

concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compare_and_set(old_value, new_value) succeeds; Numeric compare_and_set, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a result, once an AtomicReference contains Float::NAN, calling #update repeatedly evaluates the caller's block and never returns. In services that store externally derived numeric values in an AtomicReference, this can cause CPU exhaustion or permanent request/job hangs. This vulnerability is fixed in 1.3.7.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

不可达退出条件的循环(无限循环)

ruby-concurrency concurrent-ruby 资源管理错误漏洞

ruby-concurrency Concurrent Ruby是ruby-concurrency组织开源的一款并发编程工具库。 concurrent-ruby 1.3.7之前版本存在资源管理错误漏洞，该漏洞源于当Concurrent::AtomicReference#update的当前值为Float::NAN时，易进入永久忙重试循环，导致CPU耗尽或永久请求/作业挂起。以下版本受到影响：1.3.7之前版本。

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