{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0ee8afcc61466dc5f7a8f048d0632c899165b81f"
            },
            {
              "fixed": "56edca2ce35fe5589cd581644d8a4493fa5f484e"
            },
            {
              "fixed": "981597d3a4271ede64373c7a731702a42c500dd6"
            },
            {
              "fixed": "cae36053350e5215a4e0ca33cd130af9c5fc6364"
            },
            {
              "fixed": "df97d3f17f808a9916a7700a701fb85314559d56"
            },
            {
              "fixed": "f7effaed811c00b5f5bf817936bfd9c5df27b7dc"
            }
          ],
          "repo": "https://github.com/elixir-plug/plug",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-95qv-c9g9-rm63"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56814.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.4.0"
          },
          {
            "fixed": "1.16.6"
          },
          {
            "introduced": "1.17.0"
          },
          {
            "fixed": "1.17.4"
          },
          {
            "introduced": "1.18.0"
          },
          {
            "fixed": "1.18.5"
          },
          {
            "introduced": "1.19.0"
          },
          {
            "fixed": "1.19.5"
          },
          {
            "introduced": "1.20.0"
          },
          {
            "fixed": "1.20.3"
          },
          {
            "introduced": "c52b2f32c90bccd718202bafccb5f95594e30183"
          },
          {
            "fixed": "*"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "1.4.0"
          },
          {
            "fixed": "1.16.6"
          },
          {
            "introduced": "1.17.0"
          },
          {
            "fixed": "1.17.4"
          },
          {
            "introduced": "1.18.0"
          },
          {
            "fixed": "1.18.5"
          },
          {
            "introduced": "1.19.0"
          },
          {
            "fixed": "1.19.5"
          },
          {
            "introduced": "1.20.0"
          },
          {
            "fixed": "1.20.3"
          }
        ],
        "source": "CPE_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "1.4.0"
          },
          {
            "fixed": "1.16.6"
          },
          {
            "introduced": "1.17.0"
          },
          {
            "fixed": "1.17.4"
          },
          {
            "introduced": "1.18.0"
          },
          {
            "fixed": "1.18.5"
          },
          {
            "introduced": "1.19.0"
          },
          {
            "fixed": "1.19.5"
          },
          {
            "introduced": "1.20.0"
          },
          {
            "fixed": "1.20.3"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.\n\nBecause every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\n\nThis vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.\n\nThis issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.",
  "id": "CVE-2026-56814",
  "modified": "2026-07-15T01:49:02.777262537Z",
  "published": "2026-07-10T11:14:35.574Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-56814.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-56814"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56814.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/elixir-plug/plug/security/advisories/GHSA-95qv-c9g9-rm63"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56814"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/0ee8afcc61466dc5f7a8f048d0632c899165b81f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/56edca2ce35fe5589cd581644d8a4493fa5f484e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/981597d3a4271ede64373c7a731702a42c500dd6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/cae36053350e5215a4e0ca33cd130af9c5fc6364"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/df97d3f17f808a9916a7700a701fb85314559d56"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-plug/plug/commit/f7effaed811c00b5f5bf817936bfd9c5df27b7dc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elixir-plug/plug"
    }
  ],
  "schema_version": "1.8.0",
  "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)"
}