Vulnerability-Lookup

OESA-2026-2263 (CVE-2026-41316)

Vulnerability from osv_openeuler – Published: 2026-05-09 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

ruby security update

Details

Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).

Security Fix(es):

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)

Severity

8.1 (High)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-41316	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "ruby-3.2.2-152.oe2403sp1.aarch64.rpm",
          "ruby-bundled-gems-3.2.2-152.oe2403sp1.aarch64.rpm",
          "ruby-debuginfo-3.2.2-152.oe2403sp1.aarch64.rpm",
          "ruby-debugsource-3.2.2-152.oe2403sp1.aarch64.rpm",
          "ruby-devel-3.2.2-152.oe2403sp1.aarch64.rpm",
          "rubygem-bigdecimal-3.1.3-152.oe2403sp1.aarch64.rpm",
          "rubygem-io-console-0.6.0-152.oe2403sp1.aarch64.rpm",
          "rubygem-json-2.6.3-152.oe2403sp1.aarch64.rpm",
          "rubygem-openssl-3.1.0-152.oe2403sp1.aarch64.rpm",
          "rubygem-psych-5.0.1-152.oe2403sp1.aarch64.rpm",
          "rubygem-rbs-2.8.2-152.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
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          "ruby-irb-3.2.2-152.oe2403sp1.noarch.rpm",
          "rubygem-did_you_mean-1.6.3-152.oe2403sp1.noarch.rpm",
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          "rubygem-test-unit-3.5.7-152.oe2403sp1.noarch.rpm",
          "rubygem-typeprof-0.21.3-152.oe2403sp1.noarch.rpm",
          "rubygems-3.4.10-152.oe2403sp1.noarch.rpm",
          "rubygems-devel-3.4.10-152.oe2403sp1.noarch.rpm"
        ],
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        ],
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          "ruby-debuginfo-3.2.2-152.oe2403sp1.x86_64.rpm",
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          "rubygem-bigdecimal-3.1.3-152.oe2403sp1.x86_64.rpm",
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          "rubygem-rbs-2.8.2-152.oe2403sp1.x86_64.rpm"
        ]
      },
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      },
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            }
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        }
      ]
    },
    {
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      },
      "package": {
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        "purl": "pkg:rpm/openEuler/ruby\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
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        "src": [
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          "ruby-3.2.2-152.oe2403sp3.src.rpm",
          "ruby-3.2.2-152.oe2403.src.rpm"
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          "ruby-bundled-gems-3.2.2-152.oe2403sp1.x86_64.rpm",
          "ruby-debuginfo-3.2.2-152.oe2403sp1.x86_64.rpm",
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  "details": "Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).\r\n\r\nSecurity Fix(es):\n\nERB 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)",
  "id": "OESA-2026-2263",
  "modified": "2026-08-06T11:11:14Z",
  "published": "2026-05-09T11:11:14Z",
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      "type": "ADVISORY",
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CVE-2026-41316 (GCVE-0-2026-41316)

Vulnerability from cvelistv5 – Published: 2026-04-24 02:35 – Updated: 2026-08-24 12:06

Title

ERB has an @_init deserialization guard bypass via def_module / def_method / def_class

Summary

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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-25 01:45 UTC

CWE

CWE-693 - Protection Mechanism Failure
CWE-502 - Deserialization of Untrusted Data

Assigner

GitHub_M mitre root Scorecard

References

17 references

URL	Tags
https://github.com/ruby/erb/security/advisories/G…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-41316	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2461369	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:33478	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18065	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20606	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20614	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20670	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35834	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26312	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26655	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33462	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37238	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18039	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18030	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20596	vendor-advisoryx_refsource_REDHAT

Impacted products

19 products

Vendor	Product	Version
ruby	erb	Affected: < 4.0.3.1 Affected: = 4.0.4 Affected: >= 5.0.0, < 6.0.1.1 Affected: >= 6.0.2, < 6.0.4
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.3.10-12.el10_1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.0.3-34.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:3.3.10-11.el10_0.1 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260428163940.489197e6 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9070020260428163621.9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:3.0.7-166.el9_7 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9080020260513131334.9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	Unaffected: 0:3.0.4-160.2.el9_0 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.0
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 0:3.0.4-161.el9_2.3 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:3.0.7-162.el9_4.2 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 9040020260520083544.9 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:3.0.7-165.el9_6.1 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 9060020260630075016.9 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Show details on NVD website

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            "url": "https://access.redhat.com/errata/RHSA-2026:33462"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:37238"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:18039"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:18030"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:20596"
          }
        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:33478: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:18065: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:20606: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:20614: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:20670: Red Hat Enterprise Linux AppStream E4S (v.9.0)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35834: Red Hat Enterprise Linux AppStream E4S (v.9.2)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26312: Red Hat Enterprise Linux AppStream E4S (v.9.4)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26655: Red Hat Enterprise Linux AppStream E4S (v.9.4)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33462: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:37238: Red Hat Enterprise Linux AppStream EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:18039: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:18030: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:20596: Red Hat Enterprise Linux AppStream (v. 9)"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-04-24T03:01:16.620Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-04-24T02:35:41.160Z",
            "value": "Made public."
          }
        ],
        "title": "erb: ERB: Arbitrary code execution via deserialization bypass",
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "erb",
          "vendor": "ruby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.0.3.1"
            },
            {
              "status": "affected",
              "version": "= 4.0.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 6.0.1.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 6.0.2, \u003c 6.0.4"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-693",
              "description": "CWE-693: Protection Mechanism Failure",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T02:35:41.160Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv"
        }
      ],
      "source": {
        "advisory": "GHSA-q339-8rmv-2mhv",
        "discovery": "UNKNOWN"
      },
      "title": "ERB has an @_init deserialization guard bypass via def_module / def_method / def_class"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41316",
    "datePublished": "2026-04-24T02:35:41.160Z",
    "dateReserved": "2026-04-20T14:01:46.671Z",
    "dateUpdated": "2026-08-24T12:06:46.132Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-2263 (CVE-2026-41316)

CVE-2026-41316 (GCVE-0-2026-41316)

Tags

Sightings

Nomenclature

Related by attack behaviour