Moderate Security Vulnerability in Ruby Package: Denial of Service and Userinfo Leakage
Summary
RLSA-2025:8131: Moderate: ruby security update. Affects ruby versions < 0:3.3.8-10.el10_0. Fixed in 0:3.3.8-10.el10_0. How to fix ↓
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Background
Ruby is an extensible, interpreted, object-oriented scripting language widely used for web development and system management tasks. It is known for its simplicity and productivity, allowing developers to write clean and maintainable code. However, recent vulnerabilities have been identified that could potentially compromise the security of applications using Ruby, particularly in its net-imap and CGI modules.
Vulnerability Detail
The vulnerabilities identified in Ruby include a Denial of Service (DoS) risk due to memory exhaustion in the net-imap module (CVE-2025-25186), a DoS in CGI::Cookie.parse (CVE-2025-27219), and userinfo leakage in URI manipulation methods (CVE-2025-27221). These vulnerabilities can lead to application crashes, unauthorized access to sensitive information, and overall degradation of service performance.
How To Fix
Minimum fixed version
0:3.3.8-10.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, you can limit the input size for the net-imap and CGI modules to mitigate the risk of memory exhaustion and DoS attacks. Implementing input validation and sanitization can also help reduce exposure to these vulnerabilities.
Conclusion
In summary, Ruby has identified several vulnerabilities that could impact applications using its net-imap and CGI modules. It is crucial to update to the latest patched version to mitigate these risks. Additionally, implementing workarounds can provide temporary relief while ensuring that security best practices are followed.
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FAQ
CVE-2025-25186 refers to a vulnerability in the net-imap module of Ruby that allows for a Denial of Service attack through memory exhaustion.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
The vulnerabilities can lead to application crashes, unauthorized access to sensitive data, and overall service degradation, affecting user experience and security.
Yes, you can implement input validation and limit input sizes for the affected modules as a temporary workaround until you can apply the updates.
The CVSS score for these vulnerabilities is 6.5, indicating a moderate level of risk.
References
Related vulnerabilities
Recent vulnerabilities recorded for ruby.
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