Protection Mechanism Failure Affecting ruby3.1 package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.05% (15th percentile)

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  • Snyk IDSNYK-DEBIAN12-RUBY31-16299487
  • published26 Apr 2026
  • disclosed24 Apr 2026

Introduced: 24 Apr 2026

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

How to fix?

There is no fixed version for Debian:12 ruby3.1.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby3.1 package and not the ruby3.1 package as distributed by Debian. See How to fix? for Debian:12 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