ubuntu-cve-2025-61921
Vulnerability from osv_ubuntu
Published
2025-10-10 20:15
Modified
2026-05-20 15:22
Summary
Details

Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the If-Match and If-None-Match header parsing component of Sinatra, if the etag method is used when constructing the response. Carefully crafted input can cause If-Match and If-None-Match header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the ETag header value. Any applications that use the etag method when generating a response are impacted. Version 4.2.0 fixes the issue.

Severity
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
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": "ruby-sinatra",
            "binary_version": "1.4.7-3ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ruby-sinatra",
        "purl": "pkg:deb/ubuntu/ruby-sinatra@1.4.7-3ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.6-2",
        "1.4.7-3",
        "1.4.7-3ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-sinatra",
            "binary_version": "1.4.8-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "ruby-sinatra",
        "purl": "pkg:deb/ubuntu/ruby-sinatra@1.4.8-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.7-5",
        "1.4.8-1",
        "1.4.8-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rack-protection",
            "binary_version": "2.0.8.1-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "ruby-sinatra",
            "binary_version": "2.0.8.1-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "ruby-sinatra-contrib",
            "binary_version": "2.0.8.1-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "ruby-sinatra",
        "purl": "pkg:deb/ubuntu/ruby-sinatra@2.0.8.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.5-4ubuntu1",
        "2.0.8.1-1",
        "2.0.8.1-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rack-protection",
            "binary_version": "2.0.8.1-2+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "ruby-sinatra",
            "binary_version": "2.0.8.1-2+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "ruby-sinatra-contrib",
            "binary_version": "2.0.8.1-2+deb11u1build0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ruby-sinatra",
        "purl": "pkg:deb/ubuntu/ruby-sinatra@2.0.8.1-2+deb11u1build0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.8.1-2",
        "2.0.8.1-2+deb11u1build0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ruby-rack-protection",
            "binary_version": "4.2.1-1"
          },
          {
            "binary_name": "ruby-sinatra",
            "binary_version": "4.2.1-1"
          },
          {
            "binary_name": "ruby-sinatra-contrib",
            "binary_version": "4.2.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby-sinatra",
        "purl": "pkg:deb/ubuntu/ruby-sinatra@4.2.1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.1-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.1-5"
      ]
    }
  ],
  "aliases": [],
  "details": "Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response. Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted. Version 4.2.0 fixes the issue.",
  "id": "UBUNTU-CVE-2025-61921",
  "modified": "2026-05-20T15:22:57Z",
  "published": "2025-10-10T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-61921"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-61921"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sinatra/sinatra/security/advisories/GHSA-mr3q-g2mv-mr4q"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    },
    {
      "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-2025-61921"
  ]
}



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