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CVE-2025-59830— Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters

Quick assessment

Affected
rack rack
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rack是Rack开源的一个模块化的Ruby web服务器界面。 Rack 2.2.18之前版本存在安全漏洞，该漏洞源于Rack::QueryParser仅对使用&分隔的参数强制执行params_limit限制，但仍同时接受&和;作为分隔符，攻击者可利用;分隔符绕过参数数量限制，可能导致CPU和内存消耗增加。

CVSS 7.5 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-59830

Vulnerability Information
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Vulnerability Title
Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters
Source: CVE Program / CVE List V5
Vulnerability Description
Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Rack 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rack是Rack开源的一个模块化的Ruby web服务器界面。 Rack 2.2.18之前版本存在安全漏洞，该漏洞源于Rack::QueryParser仅对使用&分隔的参数强制执行params_limit限制，但仍同时接受&和;作为分隔符，攻击者可利用;分隔符绕过参数数量限制，可能导致CPU和内存消耗增加。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rack rack < 2.2.18 -

II. Public POCs for CVE-2025-59830

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11887 chars
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III. Intelligence Information for CVE-2025-59830

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Vendor Advisories for CVE-2025-59830 (1)

IV. Related Vulnerabilities

Same product: rack
Same vendor: rack
Same weakness: CWE-400

V. Comments for CVE-2025-59830

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