Critical Security Update for Ruby Package: Addressing Multiple Vulnerabilities
Summary
ALSA-2026:33576: Important: ruby:3.3 security update. Affects ruby versions < 3.3.10-7.module_el9.8.0+272+38177c5f. Fixed in 3.3.10-7.module_el9.8.0+272+38177c5f. 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 ecosystem of libraries and tools, making it a popular choice among developers. However, recent vulnerabilities have been identified in its net-imap library, which could lead to severe security risks if not addressed promptly.
Vulnerability Detail
The vulnerabilities in Ruby's net-imap library include a Denial of Service (DoS) via crafted IMAP responses (CVE-2026-42245), IMAP Command Injection via Symbol Arguments (CVE-2026-42258), and Information Disclosure via man-in-the-middle attacks that bypass TLS (CVE-2026-42246). These vulnerabilities can lead to service disruptions, unauthorized access to sensitive information, and potential exploitation by malicious actors.
How To Fix
Minimum fixed version
3.3.10-7.module_el9.8.0+272+38177c5f
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 workaround, consider disabling the net-imap functionality until the update can be applied. This can be done by commenting out or removing any code that utilizes the net-imap library in your application.
Conclusion
In summary, the recent vulnerabilities in Ruby's net-imap library pose significant security risks that must be addressed promptly. Updating to the patched version is crucial to maintaining the integrity and security of applications using Ruby. Utilize tools like Vulert to monitor for vulnerabilities and ensure your software remains secure.
See every vulnerability recorded for ruby →
FAQ
CVE-2026-42245 refers to a vulnerability in Ruby's net-imap library that allows for Denial of Service attacks through crafted IMAP responses.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Failing to address these vulnerabilities can lead to service disruptions, unauthorized access to sensitive data, and potential exploitation by attackers.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
If immediate updates are not possible, consider implementing temporary workarounds such as disabling the affected functionality until the update can be applied.
Related vulnerabilities
Recent vulnerabilities recorded for ruby.
