ubuntu-cve-2025-59830
Vulnerability from osv_ubuntu
Published
2025-09-26 00:00
Modified
2026-04-17 09:10
Summary
Details

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librack-ruby",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "librack-ruby1.8",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "librack-ruby1.9.1",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.5.2-3+deb8u3ubuntu1~esm11?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-1",
        "1.5.2-1ubuntu0.1~esm1",
        "1.5.2-3+deb8u3ubuntu1~esm2",
        "1.5.2-3+deb8u3ubuntu1~esm3",
        "1.5.2-3+deb8u3ubuntu1~esm4",
        "1.5.2-3+deb8u3ubuntu1~esm6",
        "1.5.2-3+deb8u3ubuntu1~esm7",
        "1.5.2-3+deb8u3ubuntu1~esm8",
        "1.5.2-3+deb8u3ubuntu1~esm9",
        "1.5.2-3+deb8u3ubuntu1~esm10",
        "1.5.2-3+deb8u3ubuntu1~esm11"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-3ubuntu0.2+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.6.4-3ubuntu0.2+esm10?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-4",
        "1.6.4-2",
        "1.6.4-3",
        "1.6.4-3ubuntu0.1",
        "1.6.4-3ubuntu0.2",
        "1.6.4-3ubuntu0.2+esm1",
        "1.6.4-3ubuntu0.2+esm2",
        "1.6.4-3ubuntu0.2+esm4",
        "1.6.4-3ubuntu0.2+esm5",
        "1.6.4-3ubuntu0.2+esm6",
        "1.6.4-3ubuntu0.2+esm7",
        "1.6.4-3ubuntu0.2+esm8",
        "1.6.4-3ubuntu0.2+esm9",
        "1.6.4-3ubuntu0.2+esm10"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-4ubuntu0.2+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.6.4-4ubuntu0.2+esm10?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.4-4",
        "1.6.4-4ubuntu0.1",
        "1.6.4-4ubuntu0.2",
        "1.6.4-4ubuntu0.2+esm1",
        "1.6.4-4ubuntu0.2+esm2",
        "1.6.4-4ubuntu0.2+esm4",
        "1.6.4-4ubuntu0.2+esm5",
        "1.6.4-4ubuntu0.2+esm6",
        "1.6.4-4ubuntu0.2+esm7",
        "1.6.4-4ubuntu0.2+esm8",
        "1.6.4-4ubuntu0.2+esm9",
        "1.6.4-4ubuntu0.2+esm10"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "2.0.7-2ubuntu0.1+esm8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@2.0.7-2ubuntu0.1+esm8?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.7-2ubuntu0.1+esm8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.6-3",
        "2.0.7-2",
        "2.0.7-2ubuntu0.1",
        "2.0.7-2ubuntu0.1+esm1",
        "2.0.7-2ubuntu0.1+esm2",
        "2.0.7-2ubuntu0.1+esm3",
        "2.0.7-2ubuntu0.1+esm4",
        "2.0.7-2ubuntu0.1+esm5",
        "2.0.7-2ubuntu0.1+esm6",
        "2.0.7-2ubuntu0.1+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "2.1.4-5ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@2.1.4-5ubuntu1.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.4-5ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.4-3",
        "2.1.4-4",
        "2.1.4-5",
        "2.1.4-5ubuntu1",
        "2.1.4-5ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "2.2.7-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@2.2.7-1ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.7-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.4-3",
        "2.2.7-1",
        "2.2.7-1ubuntu0.1",
        "2.2.7-1ubuntu0.2",
        "2.2.7-1ubuntu0.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by \u0026, while still splitting on both \u0026 and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.",
  "id": "UBUNTU-CVE-2025-59830",
  "modified": "2026-04-17T09:10:43Z",
  "published": "2025-09-26T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-59830"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-59830"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7784-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7960-1"
    }
  ],
  "related": [
    "USN-7784-1",
    "USN-7960-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-59830"
  ]
}



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