Critical Security Update for ruby4.0: Addressing Multiple Vulnerabilities
Summary
ALSA-2026:50773: Important: ruby4.0 security, bug fix, and enhancement update. Affects ruby4.0 versions < 4.0.6-36.el10_2. Fixed in 4.0.6-36.el10_2. How to fix ↓
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Background
Ruby is an interpreted scripting language known for its simplicity and object-oriented programming capabilities. It is widely used for web development, automation, and system management tasks. The ruby4.0 package provides the Ruby programming language version 4.0, which includes various libraries and tools for developers. However, recent vulnerabilities have been identified that could compromise the security and functionality of applications relying on this package.
Vulnerability Detail
The vulnerabilities in ruby4.0 stem from various components, particularly the net-imap library and zlib. Key issues include memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820), arbitrary IMAP command injection due to improper input validation (CVE-2026-42257), and denial of service vulnerabilities linked to large iteration counts and malformed command inputs. These vulnerabilities can lead to unauthorized access, service disruptions, and potential data breaches.
How To Fix
Minimum fixed version
4.0.6-36.el10_2
This is the first release that contains the fix.
sudo dnf update ruby4.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can restrict access to the affected components or disable the use of net-imap until the packages are updated. However, this is not a permanent solution and should only be used until the update can be applied.
Conclusion
The ruby4.0 package has critical vulnerabilities that need immediate attention. Updating to the latest patched versions is crucial to ensure the security and integrity of applications using this package. Implementing the recommended fixes and workarounds will help mitigate potential risks.
See every vulnerability recorded for ruby4.0 →
FAQ
The vulnerabilities can lead to unauthorized access, data breaches, and denial of service, affecting the overall security and performance of applications.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by these vulnerabilities without needing to sign up.
If an immediate update is not possible, consider implementing temporary workarounds such as restricting access to affected components.
While specific exploits may not be publicly documented, the nature of the vulnerabilities suggests that they could be leveraged for unauthorized access and denial of service.
For detailed information, refer to the CVE pages listed in the related section of the advisory or consult the AlmaLinux security advisories.
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