CVE-2026-34831 (Medium) detected in rack-3.1.16.gem
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调研方向
先从 /Gemfile.lock 和 /vendor/cache/rack-3.1.16.gem 中的 vendored dependency 开始，然后检查依赖层级，确认 rack 是通过 rubocop-rails 引入的。将解析后的 Rack 版本更新为列出的修复版本之一，并验证 lockfile 和 vendored package 中不再包含 3.1.16。
由索引模型根据 Issue 内容生成。
描述
CVE-2026-34831 - Medium Severity Vulnerability
Vulnerable Library - rack-3.1.16.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.1.16.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.1.16.gem
Dependency Hierarchy:
- manageiq-style-1.3.3.gem (Root Library)
- rubocop-rails-2.32.0.gem
- ❌ rack-3.1.16.gem (Vulnerable Library)
- rubocop-rails-2.32.0.gem
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent-encoded UTF-8 characters. This results in incorrect HTTP response framing and may cause response desynchronization in deployments that rely on the incorrect Content-Length value. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34831
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
Suggested Fix
Type: Upgrade version
Origin: https://github.com/advisories/GHSA-q2ww-5357-x388
Release Date: 2026-04-02
Fix Resolution: rack - 3.1.21,rack - 3.2.6,rack - 2.2.23
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