CVE-2026-34827— Rack 安全漏洞

Rack: Algorithmic-Complexity DoS in Rack::Multipart::Parser

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parser#handle_mime_head parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated String#index searches combined with String#slice! prefix deletion. For escape-heavy quoted values, this causes super-linear processing. An unauthenticated attacker can send a crafted multipart/form-data request containing many parts with long backslash-escaped parameter values to trigger excessive CPU usage during multipart parsing. This results in a denial of service condition in Rack applications that accept multipart form data. This issue has been patched in versions 3.1.21 and 3.2.6.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

算法复杂性

Rack 安全漏洞

Rack是Rack开源的一个模块化的Ruby web服务器界面。 Rack 3.1.21之前版本和3.2.6之前版本存在安全漏洞，该漏洞源于Rack::Multipart::Parser#handle_mime_head解析带引号的多部分参数时处理不当，可能导致拒绝服务。

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