GHSA-V5H6-C2HV-HV3R

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


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  • 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.
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  • 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.



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