CVE-2026-54904 (High) detected in concurrent-ruby-1.3.5.gem
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评估
调研方向
从 /Gemfile.lock 和 /vendor/cache/concurrent-ruby-1.3.5.gem 中的 vendored dependency 开始；检查 concurrent-ruby 如何通过列出的依赖链得到解析。将 dependency 更新到 v1.3.7，然后验证 lockfile 和 vendor cache 中不再包含 1.3.5，并确认 CVE 扫描结果正常。
由索引模型根据 Issue 内容生成。
描述
CVE-2026-54904 - High Severity Vulnerability
Vulnerable Library - concurrent-ruby-1.3.5.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.3.5.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/concurrent-ruby-1.3.5.gem
Dependency Hierarchy:
- manageiq-style-1.3.3.gem (Root Library)
- more_core_extensions-4.5.1.gem
- activesupport-8.0.2.gem
- ❌ concurrent-ruby-1.3.5.gem (Vulnerable Library)
- activesupport-8.0.2.gem
- more_core_extensions-4.5.1.gem
Found in base branch: master
Vulnerability Details
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.
Publish Date: 2026-06-24
URL: CVE-2026-54904
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
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