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.

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.

The version of ruby installed on the remote host is prior to 2.0.0.648-36. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3284 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.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0297 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-41316:
    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016801 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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
315028	Amazon Linux 2023 : ruby3.4, ruby3.4-bundled-gems, ruby3.4-default-gems (ALAS2023-2026-1690)	Nessus	Amazon Linux Local Security Checks	high
314590	Amazon Linux 2 : ruby, --advisory ALAS2-2026-3284 (ALAS-2026-3284)	Nessus	Amazon Linux Local Security Checks	high
314504	TencentOS Server 4: ruby (TSSA-2026:0297)	Nessus	Tencent Local Security Checks	high
313491	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: ruby (UTSA-2026-016801)	Nessus	Unity Linux Local Security Checks	high
310176	Linux Distros Unpatched Vulnerability : CVE-2026-41316	Nessus	Misc.	high

Detections

Analytics

CVE-2026-41316

high

Tenable Plugins

high

high

high

high

high