Protection Mechanism Failure Affecting ruby:3.3/rubygem-rss package, versions <0:0.3.1-6.module_el9.7.0+245+447713a2


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.05% (15th percentile)

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  • Snyk IDSNYK-ALMALINUX9-RUBY-16770250
  • published20 May 2026
  • disclosed18 May 2026

Introduced: 18 May 2026

NewCVE-2026-41316  (opens in a new tab)
CWE-693  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 ruby:3.3/rubygem-rss to version 0:0.3.1-6.module_el9.7.0+245+447713a2 or higher.
This issue was patched in ALSA-2026:18030.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby:3.3/rubygem-rss package and not the ruby:3.3/rubygem-rss package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an @_init instance variable guard in ERB#result and ERB#run to prevent code execution when an ERB object is reconstructed via Marshal.load (deserialization). However, three other public methods that also evaluate @src via eval() were not given the same guard: ERB#def_method, ERB#def_module, and ERB#def_class. An attacker who can trigger Marshal.load on untrusted data in a Ruby application that has erb loaded can use ERB#def_module (zero-arg, default parameters) as a code execution sink, bypassing the @_init protection entirely. ERB 4.0.3.1, 4.0.4.1, 6.0.1.1, and 6.0.4 patch the issue.

CVSS Base Scores

version 3.1