Critical Security Flaws in Ruby Package: Denial of Service and Command Injection Vulnerabilities
Summary
RLSA-2026:33565: Important: ruby security update. Affects ruby versions < 0:3.3.10-13.el10_2. Fixed in 0:3.3.10-13.el10_2. 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 provides features for processing text files and automating system operations. However, recent vulnerabilities in the Ruby package, specifically in the net-imap library, have raised concerns regarding its security, exposing users to potential attacks.
Vulnerability Detail
The vulnerabilities identified in the Ruby package stem from issues within the net-imap library. These include a Denial of Service (DoS) vulnerability that can be triggered by crafted IMAP responses (CVE-2026-42245), an IMAP command injection vulnerability via symbol arguments (CVE-2026-42258), and an information disclosure vulnerability that allows man-in-the-middle attacks to bypass TLS (CVE-2026-42246). These vulnerabilities can lead to service disruptions, unauthorized access to sensitive information, and exploitation of the system.
How To Fix
Minimum fixed version
0:3.3.10-13.el10_2
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, users can restrict access to the IMAP service or implement additional security layers, such as firewalls or intrusion detection systems, to help mitigate the risks until the package is updated.
Conclusion
The identified vulnerabilities in the Ruby package pose significant risks to users, including Denial of Service and command injection attacks. It is crucial to update to the latest patched version to safeguard against these threats. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
The CVSS score for the vulnerabilities is 7.4, indicating a high severity level.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check your application using the Vulert playground without any signup.
The vulnerabilities can lead to Denial of Service, unauthorized access to sensitive information, and exploitation of the system through command injection.
Yes, there is a risk of data loss or exposure due to information disclosure vulnerabilities that can be exploited by attackers.
If immediate updates are not possible, consider implementing workarounds such as restricting access to the IMAP service and enhancing security measures.
References
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