Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

CVE-2025-61771 (High) detected in rack-3.1.16.gem

Open Beginner friendly
  • Is something wrong?
#261 1 comment 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
65/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Quiet
Tech stack
ruby
Domain
security

Research direction

Start with /Gemfile.lock and the cached dependency at /vendor/cache/rack-3.1.16.gem, then review the advisory and its listed fixed Rack versions. Update the dependency to a supported fixed version and refresh the lockfile or cache as needed; done means the project no longer references rack-3.1.16.gem and uses 3.1.17, 3.2.2, or 2.2.19.

Written by the indexing model from the issue text.

Description

Mend: dependency security vulnerability stale

CVE-2025-61771 - High 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)

Found in base branch: master

Vulnerability Details

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser"stores non-file form fields (parts without a"filename") entirely in memory as Ruby "String"objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx"client_max_body_size`) and validating and rejecting unusually large form fields at the application level.
Mend Note: The description of this vulnerability differs from MITRE.

Publish Date: 2025-10-07

URL: CVE-2025-61771

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/advisories/GHSA-w9pc-fmgc-vxvw

Release Date: 2025-10-07

Fix Resolution: rack - 3.2.2,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - v2.2.19,https://github.com/rack/rack.git - v3.2.2,https://github.com/rack/rack.git - v3.1.17

Step up your Open Source Security Game with Mend here

Dominant language
Ruby
Stars
30
Forks
27
No merged PRs in 30d

Getting set up

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from ManageIQ/linux_admin

All issues in ManageIQ/linux_admin

Similar issues

More Ruby issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.