UBUNTU-CVE-2026-41316 (CVE-2026-41316)

Vulnerability from osv_ubuntu – Published: 2026-04-24 03:16 – Updated: 2026-07-16 18:24 – Source website
VLAI
Details

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
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
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      },
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            }
          ],
          "type": "ECOSYSTEM"
        }
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        "2.3.1-2~ubuntu16.04.16",
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        "2.3.1-2~ubuntu16.04.16+esm11",
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        "2.5.1-1ubuntu1.12",
        "2.5.1-1ubuntu1.13",
        "2.5.1-1ubuntu1.14",
        "2.5.1-1ubuntu1.15",
        "2.5.1-1ubuntu1.16",
        "2.5.1-1ubuntu1.16+esm1",
        "2.5.1-1ubuntu1.16+esm3",
        "2.5.1-1ubuntu1.16+esm4",
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        "2.5.1-1ubuntu1.16+esm6",
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            "binary_name": "libruby2.7",
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        "3.3.8-2ubuntu2.1"
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    },
    {
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          {
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            "binary_version": "9.4.8.0+ds-3ubuntu1"
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        ]
      },
      "package": {
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        "name": "jruby",
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      },
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        "9.4.8.0+ds-3ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libruby3.3",
            "binary_version": "3.3.8-2ubuntu3.1"
          },
          {
            "binary_name": "ruby3.3",
            "binary_version": "3.3.8-2ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby3.3",
        "purl": "pkg:deb/ubuntu/ruby3.3@3.3.8-2ubuntu3.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
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            {
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.8-2ubuntu2",
        "3.3.8-2ubuntu3",
        "3.3.8-2ubuntu3.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-41316",
  "modified": "2026-07-16T18:24:35Z",
  "published": "2026-04-24T03:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-41316"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-41316"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-41316"
  ]
}



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