Arbitrary Command Injection Affecting ruby:3.3/rubygem-mysql2 package, versions <0:0.5.5-1.module_el8.10.0+3799+191214cc


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
1.25% (69th percentile)

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  • Snyk IDSNYK-ALMALINUX8-RUBY-17816016
  • published4 Jul 2026
  • disclosed30 Jun 2026

Introduced: 30 Jun 2026

CVE-2026-42258  (opens in a new tab)
CWE-77  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 ruby:3.3/rubygem-mysql2 to version 0:0.5.5-1.module_el8.10.0+3799+191214cc or higher.
This issue was patched in ALSA-2026:33515.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby:3.3/rubygem-mysql2 package and not the ruby:3.3/rubygem-mysql2 package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

References

CVSS Base Scores

version 3.1