Moderate Security Vulnerability in Ruby Package: Memory Exhaustion and DoS Risks
Summary
ALSA-2025:8131: Moderate: ruby security update. Affects ruby versions < 3.3.8-10.el10_0. Fixed in 3.3.8-10.el10_0. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Ruby is an extensible, interpreted, object-oriented scripting language widely used for web development and system management tasks. It features a rich set of libraries and frameworks, making it a popular choice among developers. However, recent vulnerabilities have been identified that could potentially compromise the security of applications built using Ruby, particularly affecting its net-imap and CGI modules.
Vulnerability Detail
The identified vulnerabilities include a potential Denial of Service (DoS) attack through memory exhaustion in the net-imap module (CVE-2025-25186), a DoS vulnerability in CGI::Cookie.parse (CVE-2025-27219), and userinfo leakage in URI#join, URI#merge, and URI#+ (CVE-2025-27221). These vulnerabilities could allow attackers to exploit the Ruby environment, leading to service interruptions or unauthorized access to sensitive information.
How To Fix
Minimum fixed version
3.3.8-10.el10_0
This is the first release that contains the fix.
sudo dnf update rubyTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, consider limiting the input size for the affected modules to mitigate the risk of memory exhaustion and DoS attacks. Implementing rate limiting or input validation can help reduce the likelihood of exploitation until the package is updated.
Conclusion
In summary, the recent vulnerabilities identified in the Ruby package pose significant risks, including potential Denial of Service attacks and userinfo leakage. It is crucial to update to the patched version to mitigate these risks and ensure the security of applications built with Ruby.
See every vulnerability recorded for ruby →
FAQ
The vulnerabilities involve potential Denial of Service attacks and userinfo leakage, which could compromise application security.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by these vulnerabilities without needing to sign up.
Failing to address these vulnerabilities could lead to service disruptions, unauthorized access to sensitive data, and overall degradation of application performance.
Yes, you should upgrade to Ruby version 3.3.8-10.el10_0 or later to ensure that the vulnerabilities are patched.
Vulert monitors and alerts for open-source vulnerabilities in software using just a manifest file like package-lock.json, allowing you to stay informed about potential risks.
Related vulnerabilities
Recent vulnerabilities recorded for ruby.
