{
  "cveId": "CVE-2025-61921",
  "url": "https://patchblox.com/security/cve/CVE-2025-61921",
  "summary": "CVE-2025-61921 is fixed in 3 products on 1 platform, first by ruby-rack-protection 2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1, released October 10, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ruby-sinatra: Sinatra is a domain-specific language for creating web applications in Ruby",
  "description": "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 \u0060If-Match\u0060 and \u0060If-None-Match\u0060 header parsing component of Sinatra, if the \u0060etag\u0060 method is used when constructing the response. Carefully crafted input can cause \u0060If-Match\u0060 and \u0060If-None-Match\u0060 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 \u0060ETag\u0060 header value. Any applications that use the \u0060etag\u0060 method when generating a response are impacted. Version 4.2.0 fixes the issue.",
  "published": "2025-10-10T13:15:00Z",
  "severity": "Medium",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00495,
  "epssPercentile": 0.42769,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ruby-rack-protection",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "fix": "ruby-rack-protection 2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-ruby-rack-protection-2.0.8.1-2-deb11u1ubuntu0.1-esm1",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-rack-protection",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.2.1-1",
      "fix": "ruby-rack-protection 4.2.1-1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-ruby-rack-protection-4.2.1-1",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "3.0.5-3\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2025-61921",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-61921",
      "released": "2025-10-10T20:15:38Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra",
      "release": "Debian 14",
      "fixedVersion": "4.2.1-1",
      "fix": "DEBIAN-CVE-2025-61921",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-61921",
      "released": "2025-10-10T20:15:38Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.8-1ubuntu0.1~esm3",
      "fix": "ruby-sinatra 1.4.8-1ubuntu0.1~esm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-ruby-sinatra-1.4.8-1ubuntu0.1-esm3",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "fix": "ruby-sinatra 2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-ruby-sinatra-2.0.8.1-2-deb11u1ubuntu0.1-esm1",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.2.1-1",
      "fix": "ruby-sinatra 4.2.1-1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-ruby-sinatra-4.2.1-1",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra-contrib",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "fix": "ruby-sinatra-contrib 2.0.8.1-2\u002Bdeb11u1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-ruby-sinatra-contrib-2.0.8.1-2-deb11u1ubuntu0.1-esm1",
      "released": "2025-10-10T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-sinatra-contrib",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.2.1-1",
      "fix": "ruby-sinatra-contrib 4.2.1-1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-ruby-sinatra-contrib-4.2.1-1",
      "released": "2025-10-10T13:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}