FKIE_CVE-2025-61772

Vulnerability from fkie_nvd - Published: 2025-10-07 15:16 - Updated: 2026-10-19 16:10
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. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`).
References
security-advisories@github.comhttps://github.com/rack/rack/commit/589127f4ac8b5cf11cf88fb0cd116ffed4d2181ePatch
security-advisories@github.comhttps://github.com/rack/rack/commit/d869fed663b113b95a74ad53e1b5cae6ab31f29ePatch
security-advisories@github.comhttps://github.com/rack/rack/commit/e08f78c656c9394d6737c022bde087e0f33336fdPatch
security-advisories@github.comhttps://github.com/rack/rack/security/advisories/GHSA-wpv5-97wm-hp9cMitigation, Vendor Advisory
Impacted products
Vendor Product Version
rack rack *
rack rack *
rack rack *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "rack",
          "vendor": "rack",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.2.19"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.1, \u003c 3.1.17"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.2, \u003c 3.2.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "EBB6060B-A06F-4A88-8457-AD850E63E562",
              "versionEndExcluding": "2.2.19",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "850EC79C-0F31-441F-9001-B7CA0CD7758F",
              "versionEndExcluding": "3.1.17",
              "versionStartIncluding": "3.1.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "9A009CC5-8010-446E-A12B-BF5314CA5BEB",
              "versionEndExcluding": "3.2.2",
              "versionStartIncluding": "3.2.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part\u2019s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`)."
    },
    {
      "lang": "es",
      "value": "Rack es una interfaz modular de servidor web Ruby. En versiones anteriores a la 2.2.19, 3.1.17 y 3.2.2, Rack::Multipart::Parser puede acumular datos ilimitados cuando el bloque de encabezado de una parte multipart no termina nunca con la l\u00ednea en blanco requerida (CRLFCRLF). El analizador sigue a\u00f1adiendo bytes entrantes a la memoria sin un l\u00edmite de tama\u00f1o, permitiendo a un atacante remoto agotar la memoria y causar una denegaci\u00f3n de servicio (DoS). Los atacantes pueden enviar encabezados multipart incompletos para desencadenar un alto uso de memoria, lo que lleva a la terminaci\u00f3n del proceso (OOM) o a una ralentizaci\u00f3n severa. El efecto escala con los l\u00edmites de tama\u00f1o de las solicitudes y la concurrencia. Todas las aplicaciones que manejan cargas multipart pueden verse afectadas. Las versiones 2.2.19, 3.1.17 y 3.2.2 limitan el tama\u00f1o del encabezado por parte (p. ej., 64 KiB). Como soluci\u00f3n alternativa, restrinja los tama\u00f1os m\u00e1ximos de solicitud en la capa del proxy o del servidor web (p. ej., Nginx client_max_body_size)."
    }
  ],
  "id": "CVE-2025-61772",
  "lastModified": "2026-10-19T16:10:00.260",
  "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-61772",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-10-07T17:51:19.811672Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-07T15:16:03.280",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/rack/rack/commit/589127f4ac8b5cf11cf88fb0cd116ffed4d2181e"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/rack/rack/commit/d869fed663b113b95a74ad53e1b5cae6ab31f29e"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/rack/rack/commit/e08f78c656c9394d6737c022bde087e0f33336fd"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/rack/rack/security/advisories/GHSA-wpv5-97wm-hp9c"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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