{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "rack",
          "vendor": "rack",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.2.25"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0, \u003c 3.1.23"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.2, \u003c 3.2.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-09T22:02:38.334Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm"
        },
        {
          "name": "https://github.com/rack/rack/commit/244e75a840cee0823f86d5d01dc374505a8abed8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rack/rack/commit/244e75a840cee0823f86d5d01dc374505a8abed8"
        },
        {
          "name": "https://github.com/rack/rack/commit/2eaa5b1026a03a43b6537b1a0b233707ba887702",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rack/rack/commit/2eaa5b1026a03a43b6537b1a0b233707ba887702"
        },
        {
          "name": "https://github.com/rack/rack/commit/c9b4698595050838342bd3b5a0fc9ab908065f8f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rack/rack/commit/c9b4698595050838342bd3b5a0fc9ab908065f8f"
        }
      ],
      "source": {
        "advisory": "GHSA-5v64-555j-wjxm",
        "discovery": "UNKNOWN"
      },
      "title": "Rack: Multipart parsing allows DoS via unbounded scan buffer growth"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-125111",
    "datePublished": "2026-11-09T22:02:38.334Z",
    "dateReserved": "2026-11-09T17:45:35.936Z",
    "dateUpdated": "2026-11-09T22:02:38.334Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}