Critical Security Update for Ruby Package: Addressing IMAP Command Injection and TLS Bypass Vulnerabilities
Summary
RLSA-2026:33514: Important: ruby:2.5 security update. Affects rubygem-abrt across 2 version ranges.
< 0:0.3.0-4.module+el8.5.0+738+032c9c02
< 0:0.3.0-4.module+el8.9.0+1536+5f79634e
Fixed in 0:0.3.0-4.module+el8.5.0+738+032c9c02 or 0:0.3.0-4.module+el8.9.0+1536+5f79634e, depending on the release line you run. 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 a dynamic, interpreted, object-oriented programming language known for its simplicity and productivity. It is widely used for web development, particularly with the Ruby on Rails framework. The language includes libraries for various functionalities, including 'net-imap', which facilitates communication with IMAP email servers. Recent vulnerabilities have been identified in this library, exposing users to potential security risks.
Vulnerability Detail
The vulnerabilities stem from two critical issues within the 'net-imap' library. The first, identified as CVE-2026-42258, allows for IMAP command injection through symbol arguments, potentially enabling attackers to execute arbitrary commands. The second vulnerability, CVE-2026-42246, involves information disclosure via a man-in-the-middle attack that can bypass TLS encryption, compromising sensitive data. Both vulnerabilities pose significant risks to applications relying on the 'net-imap' library, necessitating immediate attention.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
sudo dnf update rubygem-abrt-
< 0:0.3.0-4.module+el8.5.0+738+032c9c020:0.3.0-4.module+el8.5.0+738+032c9c02 -
< 0:0.3.0-4.module+el8.9.0+1536+5f79634e0:0.3.0-4.module+el8.9.0+1536+5f79634e
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
As a temporary measure, consider disabling the use of the 'net-imap' library until the packages are updated. This can be done by commenting out any code that relies on 'net-imap' in your application until a secure version is available.
Conclusion
In summary, the identified vulnerabilities in the Ruby 'net-imap' library pose significant risks that require immediate action. Updating the affected packages is crucial to maintaining application security. Utilize tools like Vulert for ongoing monitoring and vulnerability management.
See every vulnerability recorded for rubygem-abrt →
FAQ
The CVSS score for these vulnerabilities is 7.4, indicating a high severity level.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by these vulnerabilities without requiring any signup.
The vulnerabilities can lead to unauthorized command execution and sensitive data exposure, which can severely compromise application security.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If immediate updates are not possible, consider implementing workarounds such as disabling the affected library or restricting access to sensitive functionalities.
Related vulnerabilities
Recent vulnerabilities recorded for rubygem-abrt.
