{"api_version":"1","generated_at":"2026-07-10T22:02:38+00:00","cve":"CVE-2026-56814","urls":{"html":"https://cve.report/CVE-2026-56814","api":"https://cve.report/api/cve/CVE-2026-56814.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-56814","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-56814"},"summary":{"title":"Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)","description":"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.","state":"PUBLISHED","assigner":"EEF","published_at":"2026-07-10 12:17:24","updated_at":"2026-07-10 17:56:00"},"problem_types":["CWE-770","CWE-770 CWE-770 Allocation of Resources Without Limits or 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The parser charges the <tt>:length</tt> limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.</p><p>Because every part whose <tt>Content-Disposition</tt> carries a non-empty <tt>filename</tt> creates a fresh temporary file (via <tt>Plug.Upload</tt>) and retains a <tt>Plug.Upload</tt> 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 <tt>:length</tt> 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 <tt>Plug.Parsers</tt> with the <tt>:multipart</tt> parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.</p><p>This vulnerability is associated with program files <tt>lib/plug/parsers/multipart.ex</tt> and program routines <tt>Plug.Parsers.MULTIPART.parse_multipart/2</tt>, <tt>Plug.Parsers.MULTIPART.parse_multipart_headers/5</tt>, <tt>Plug.Parsers.MULTIPART.parse_multipart_body/4</tt>, and <tt>Plug.Parsers.MULTIPART.parse_multipart_file/4</tt>.</p><p>This 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.</p>"}],"value":"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. 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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."}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive 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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.","Type":"Description","Title":"Plug: multipart :length limit is not charged for part headers, e"}]}}}