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Amazon Linux 2023 : ruby3.4, ruby3.4-bundled-gems, ruby3.4-default-gems (ALAS2023-2026-1690)
high Nessus Plugin ID 315028
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Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1690 advisory.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. (CVE-2026-41316)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Run 'dnf update ruby3.4 --releasever 2023.11.20260514' or or 'dnf update --advisory ALAS2023-2026-1690 --releasever 2023.11.20260514' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1690.html
Plugin Details
Severity: High
ID: 315028
File Name: al2023_ALAS2023-2026-1690.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 5/16/2026
Updated: 5/16/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
CVSS v2
Risk Factor: High
Base Score: 7.6
Temporal Score: 5.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-41316
CVSS v3
Risk Factor: High
Base Score: 8.1
Temporal Score: 7.1
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:ruby3.4-rubygem-rdoc, p-cpe:/a:amazon:linux:ruby3.4-rubygem-rake, p-cpe:/a:amazon:linux:ruby3.4-rubygem-racc, p-cpe:/a:amazon:linux:ruby3.4-rubygem-bundler, p-cpe:/a:amazon:linux:ruby3.4-rubygem-io-console, p-cpe:/a:amazon:linux:ruby3.4-rubygem-bigdecimal, p-cpe:/a:amazon:linux:ruby3.4-debugsource, p-cpe:/a:amazon:linux:ruby3.4-rubygem-io-console-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygem-bigdecimal-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygem-psych, p-cpe:/a:amazon:linux:ruby3.4-rubygem-psych-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygem-rbs-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygems-devel, p-cpe:/a:amazon:linux:ruby3.4-rubygem-rbs, p-cpe:/a:amazon:linux:ruby3.4-rubygem-racc-debuginfo, p-cpe:/a:amazon:linux:ruby3.4, p-cpe:/a:amazon:linux:ruby3.4-rubygem-json-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygem-rss, p-cpe:/a:amazon:linux:ruby3.4-libs-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-bundled-gems-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-rubygem-minitest, p-cpe:/a:amazon:linux:ruby3.4-bundled-gems, p-cpe:/a:amazon:linux:ruby3.4-rubygems, p-cpe:/a:amazon:linux:ruby3.4-rubygem-power_assert, p-cpe:/a:amazon:linux:ruby3.4-rubygem-test-unit, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:ruby3.4-default-gems, p-cpe:/a:amazon:linux:ruby3.4-rubygem-typeprof, p-cpe:/a:amazon:linux:ruby3.4-debuginfo, p-cpe:/a:amazon:linux:ruby3.4-doc, p-cpe:/a:amazon:linux:ruby3.4-rubygem-rexml, p-cpe:/a:amazon:linux:ruby3.4-devel, p-cpe:/a:amazon:linux:ruby3.4-libs, p-cpe:/a:amazon:linux:ruby3.4-rubygem-json, p-cpe:/a:amazon:linux:ruby3.4-rubygem-irb
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 5/15/2026
Vulnerability Publication Date: 4/24/2026
Reference Information
CVE: CVE-2026-41316