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CVE-2025-61772— Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)

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 2.2.19之前版本、3.1.17之前版本和3.2.2之前版本存在资源管理错误漏洞，该漏洞源于多部分标头解析时缺少大小限制，可能导致内存耗尽和拒绝服务攻击。

CVSS 7.5 · High EPSS 0.93% · P59

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-61772

Vulnerability Information
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Vulnerability Title
Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
Source: CVE Program / CVE List V5
Vulnerability Description
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`).
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 资源管理错误漏洞
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 2.2.19之前版本、3.1.17之前版本和3.2.2之前版本存在资源管理错误漏洞，该漏洞源于多部分标头解析时缺少大小限制，可能导致内存耗尽和拒绝服务攻击。
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 < 2.2.19 -

II. Public POCs for CVE-2025-61772

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8925 chars
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III. Intelligence Information for CVE-2025-61772

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Patches & Fixes for CVE-2025-61772 (3)

Vendor Advisories for CVE-2025-61772 (1)

Same Patch Batch · rack · 2025-10-07 · 3 CVEs total

CVE-2025-61771 7.5 HIGH Rack's multipart parser buffers large non‑file fields entirely in memory, enabling DoS (me
CVE-2025-61770 7.5 HIGH Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion)

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-61772

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