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CVE-2026-41316

Full vulnerability record from the local CVENow database.

Description

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.

Severity
HIGH
CVSS score
8.1 (v3.1)
Vulnerability status
Deferred
Source identifier
[email protected]
Published
2026-04-24 03:16:11.897000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON 
{
  "id": "CVE-2026-41316",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-24T03:16:11.897",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "ERB es un sistema de plantillas para Ruby. Ruby 2.7.0 (antes de que ERB 2.2.0 fuera publicado en rubygems.org) introdujo una protección de variable de instancia “@_init” en “ERB#result” y “ERB#run” para prevenir la ejecución de código cuando un objeto ERB es reconstruido a través de “Marshal.load” (deserialización). Sin embargo, otros tres métodos públicos que también evalúan “@src” a través de “eval()” no recibieron la misma protección: “ERB#def_method”, “ERB#def_module” y “ERB#def_class”. Un atacante que pueda activar “Marshal.load” en datos no confiables en una aplicación Ruby que tenga “erb” cargado puede usar “ERB#def_module” (cero argumentos, parámetros predeterminados) como un sumidero de ejecución de código, eludiendo completamente la protección “@_init”. ERB 4.0.3.1, 4.0.4.1, 6.0.1.1 y 6.0.4 aplican un parche al problema."
    }
  ],
  "affected": [
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      "source": "[email protected]",
      "affectedData": [
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              "version": ">= 5.0.0, < 6.0.1.1",
              "status": "affected"
            },
            {
              "version": ">= 6.0.2, < 6.0.4",
              "status": "affected"
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  "metrics": {
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        "type": "Secondary",
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