FKIE_CVE-2025-61919

Vulnerability from fkie_nvd - Published: 2025-10-10 20:15 - Updated: 2025-11-03 19:28
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).
References
security-advisories@github.comhttps://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881Patch
security-advisories@github.comhttps://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9dbPatch
security-advisories@github.comhttps://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146fPatch
security-advisories@github.comhttps://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mmThird Party Advisory, Mitigation
Impacted products
Vendor Product Version
rack rack *
rack rack *
rack rack *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "2077D030-4BE1-4CB4-8C9B-ACCA0B01BB0D",
              "versionEndExcluding": "2.2.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "52554FFF-7EF2-473A-8686-6D029CC8F6EF",
              "versionEndExcluding": "3.1.18",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "AA3F6ADB-DBDD-4C26-A019-D5AE5961F3CC",
              "versionEndExcluding": "3.2.3",
              "versionStartIncluding": "3.2.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`)."
    }
  ],
  "id": "CVE-2025-61919",
  "lastModified": "2025-11-03T19:28:04.420",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-10-10T20:15:37.730",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881"
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      "source": "security-advisories@github.com",
      "tags": [
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    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Mitigation"
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      "url": "https://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mm"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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