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CVE-2026-40560— Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence

Quick assessment

Affected
MIYAGAWA Starman
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Starman是Tatsuhiko Miyagawa个人开发者的一款高性能预派生Web服务器。 Starman 0.4018之前版本存在环境问题漏洞，该漏洞源于HTTP请求夹带技术，由于标头优先级处理不当，Starman在HTTP请求中同时存在Content-Length和Transfer-Encoding: chunked标头时错误地优先处理Content-Length，可能导致攻击者通过前端反向代理夹带恶意HTTP请求。

AI Predicted 7.5 Difficulty: Easy EPSS 0.54% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
MIYAGAWA Starman < 0.4018 affected
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I. Basic Information for CVE-2026-40560

Vulnerability Information
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Vulnerability Title
Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence
Source: CVE Program / CVE List V5
Vulnerability Description
Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starman incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
Starman 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Starman是Tatsuhiko Miyagawa个人开发者的一款高性能预派生Web服务器。 Starman 0.4018之前版本存在环境问题漏洞，该漏洞源于HTTP请求夹带技术，由于标头优先级处理不当，Starman在HTTP请求中同时存在Content-Length和Transfer-Encoding: chunked标头时错误地优先处理Content-Length，可能导致攻击者通过前端反向代理夹带恶意HTTP请求。
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
MIYAGAWA Starman 0 ~ 0.4018 -

II. Public POCs for CVE-2026-40560

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III. Intelligence Information for CVE-2026-40560

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Patches & Fixes for CVE-2026-40560 (1)

Vendor Advisories for CVE-2026-40560 (1)

IV. Related Vulnerabilities

Same vendor: MIYAGAWA
Same weakness: CWE-444

V. Comments for CVE-2026-40560

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