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CVE-2023-40175— Inconsistent Interpretation of HTTP Requests in puma

Quick assessment

Affected
puma puma
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.

Puma是美国Evan Phoenix个人开发者的一款针对高并发应用的Web服务器。 Puma存在环境问题漏洞，该漏洞源于在解析分块传输编码主体中的尾随字段和零长度Content-Length标头时存在安全问题。受影响的产品和版本：Puma 6.3.1之前版本，5.6.7之前版本。

CVSS 7.3 · High EPSS 0.85% · P57

Possible ATT&CK Techniques 1 AI

T1071.001 · Web Protocols
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I. Basic Information for CVE-2023-40175

Vulnerability Information
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Vulnerability Title
Inconsistent Interpretation of HTTP Requests in puma
Source: CVE Program / CVE List V5
Vulnerability Description
Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Puma是美国Evan Phoenix个人开发者的一款针对高并发应用的Web服务器。 Puma存在环境问题漏洞，该漏洞源于在解析分块传输编码主体中的尾随字段和零长度Content-Length标头时存在安全问题。受影响的产品和版本：Puma 6.3.1之前版本，5.6.7之前版本。
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
puma puma < 5.6.7 -

II. Public POCs for CVE-2023-40175

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7399 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2023-40175

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Patches & Fixes for CVE-2023-40175 (1)

Vendor Advisories for CVE-2023-40175 (1)

IV. Related Vulnerabilities

Same product: puma
Same vendor: puma
Same weakness: CWE-444

V. Comments for CVE-2023-40175

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