CVE-2026-56814— elixir-plug plug 资源管理错误漏洞

Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)

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. Because 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. This 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. 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.

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

不加限制或调节的资源分配

elixir-plug plug 资源管理错误漏洞

elixir-plug plug是elixir-plug团队的一个Web应用程序组件框架。 elixir-plug plug存在资源管理错误漏洞，该漏洞源于Plug.Parsers.MULTIPART解析器未对资源消耗强制执行:length预算，可能导致未经身份验证的远程攻击者通过发送大量空文件部分请求造成拒绝服务。以下版本受到影响：1.4.0至1.16.6之前版本、1.17.0至1.17.4之前版本、1.18.0至1.18.5之前版本、1.19.0至1.19.5之前版本和1.20.0至1.20.3之前版

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