ghsa-xh69-987w-hrp8
Vulnerability from github
Published
2025-07-15 14:37
Modified
2025-07-15 22:56
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.6 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Summary
resolv vulnerable to DoS via insufficient DNS domain name length validation
Details

A denial of service vulnerability has been discovered in the resolv gem bundled with Ruby.

Details

The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.

An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.

This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.

Affected Version

The vulnerability affects the resolv gem bundled with the following Ruby series: * Ruby 3.2 series: resolv version 0.2.2 and earlier * Ruby 3.3 series: resolv version 0.3.0 * Ruby 3.4 series: resolv version 0.6.1 and earlier

Credits

Thanks to Manu for discovering this issue.

History

Originally published at 2025-07-08 07:00:00 (UTC)

Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "resolv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "resolv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "resolv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.0"
            },
            {
              "fixed": "0.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-24294"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284",
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-15T14:37:08Z",
    "nvd_published_at": "2025-07-12T04:15:46Z",
    "severity": "MODERATE"
  },
  "details": "A denial of service vulnerability has been discovered in the resolv gem bundled with Ruby.\n\n## Details\nThe vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.\n\nAn attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting\nlength of the name.\n\nThis resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.\n\n## Affected Version\nThe vulnerability affects the resolv gem bundled with the following Ruby series:\n* Ruby 3.2 series: resolv version 0.2.2 and earlier\n* Ruby 3.3 series: resolv version 0.3.0\n* Ruby 3.4 series: resolv version 0.6.1 and earlier\n\n## Credits\nThanks to Manu for discovering this issue.\n\n## History\nOriginally published at 2025-07-08 07:00:00 (UTC)",
  "id": "GHSA-xh69-987w-hrp8",
  "modified": "2025-07-15T22:56:19Z",
  "published": "2025-07-15T14:37:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-24294"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/resolv/commit/4c2f71b5e80826506f78417d85b38481c058fb25"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ruby/resolv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/resolv/CVE-2025-24294.yml"
    },
    {
      "type": "WEB",
      "url": "https://www.ruby-lang.org/en/news/2025/07/08/dos-resolv-cve-2025-24294"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "resolv vulnerable to DoS via insufficient DNS domain name length validation"
}


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