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GHSA-V5H6-C2HV-HV3R

Vulnerability from github – Published: 2024-03-25 19:36 – Updated: 2025-11-04 19:46

Summary

StringIO buffer overread vulnerability

Details

An issue was discovered in StringIO 3.0.1, as distributed in Ruby 3.0.x through 3.0.6 and 3.1.x through 3.1.4.

The ungetbyte and ungetc methods on a StringIO can read past the end of a string, and a subsequent call to StringIO.gets may return the memory value.

This vulnerability is not affected StringIO 3.0.3 and later, and Ruby 3.2.x and later.

We recommend to update the StringIO gem to version 3.0.3 or later. In order to ensure compatibility with bundled version in older Ruby series, you may update as follows instead:

For Ruby 3.0 users: Update to stringio 3.0.1.1
For Ruby 3.1 users: Update to stringio 3.1.0.2

You can use gem update stringio to update it. If you are using bundler, please add gem "stringio", ">= 3.0.1.2" to your Gemfile.

Severity

9.8 (Critical)


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

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "stringio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-27280"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120",
      "CWE-126"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-03-25T19:36:52Z",
    "nvd_published_at": "2024-05-14T15:11:56Z",
    "severity": "CRITICAL"
  },
  "details": "An issue was discovered in StringIO 3.0.1, as distributed in Ruby 3.0.x through 3.0.6 and 3.1.x through 3.1.4.\n\nThe `ungetbyte` and `ungetc` methods on a StringIO can read past the end of a string, and a subsequent call to `StringIO.gets` may return the memory value.\n\nThis vulnerability is not affected StringIO 3.0.3 and later, and Ruby 3.2.x and later.\n\nWe recommend to update the StringIO gem to version 3.0.3 or later. In order to ensure compatibility with bundled version in older Ruby series, you may update as follows instead:\n\n* For Ruby 3.0 users: Update to `stringio` 3.0.1.1\n* For Ruby 3.1 users: Update to `stringio` 3.1.0.2\n\nYou can use `gem update stringio` to update it. If you are using bundler, please add `gem \"stringio\", \"\u003e= 3.0.1.2\"` to your `Gemfile`.",
  "id": "GHSA-v5h6-c2hv-hv3r",
  "modified": "2025-11-04T19:46:14Z",
  "published": "2024-03-25T19:36:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27280"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/stringio/commit/0e596524097706263d10900ca180898e4a8f5233"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/stringio/commit/c58c5f54f1eab99665ea6a161d29ff6a7490afc8"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1399856"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ruby/stringio"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/stringio/CVE-2024-27280.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/27LUWREIFTP3MQAW7QE4PJM4DPAQJWXF"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XYDHPHEZI7OQXTQKTDZHGZNPIJH7ZV5N"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20250502-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.ruby-lang.org/en/news/2024/03/21/buffer-overread-cve-2024-27280"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2025/Sep/53"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2025/Sep/54"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2025/Sep/55"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "StringIO buffer overread vulnerability"
}

CVE-2024-27280 (GCVE-0-2024-27280)

Vulnerability from cvelistv5 – Published: 2024-05-08 20:51 – Updated: 2025-11-04 17:17

Summary

A buffer-overread issue was discovered in StringIO 3.0.1, as distributed in Ruby 3.0.x through 3.0.6 and 3.1.x through 3.1.4. The ungetbyte and ungetc methods on a StringIO can read past the end of a string, and a subsequent call to StringIO.gets may return the memory value. 3.0.3 is the main fixed version; however, for Ruby 3.0 users, a fixed version is stringio 3.0.1.1, and for Ruby 3.1 users, a fixed version is stringio 3.0.1.2.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-09 18:08 UTC

CWE

n/a
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

mitre mitre root

References

9 references

URL	Tags
https://hackerone.com/reports/1399856
https://www.ruby-lang.org/en/news/2024/03/21/buff…
https://security.netapp.com/advisory/ntap-2025050…
http://seclists.org/fulldisclosure/2025/Sep/55
http://seclists.org/fulldisclosure/2025/Sep/54
http://seclists.org/fulldisclosure/2025/Sep/53
https://lists.debian.org/debian-lts-announce/2024…
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…

Impacted products

1 product

Vendor	Product	Version
ruby-lang	ruby	Affected: 3.0.3 , ≤ 3.0.6 (custom) cpe:2.3:a:ruby-lang:ruby:-:::::::*

Show details on NVD website

JSON

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{
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              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
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            }
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        "problemTypes": [
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                "cweId": "CWE-120",
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        "providerMetadata": {
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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.

Detection rules are retrieved from Rulezet.

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.