CVE-2026-40561— Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence
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I. Basic Information for CVE-2026-40561
Vulnerability Information
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Vulnerability Title
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence
Source: NVD (National Vulnerability Database)
Vulnerability Description
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starlet 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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Starlet 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Starlet是Kazuho Oku个人开发者的一款高性能HTTP/1.1预分叉Web服务器。 Starlet 0.31及之前版本存在环境问题漏洞，该漏洞源于错误优先处理Content-Length标头而非Transfer-Encoding标头，可能导致HTTP请求夹带攻击。
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
II. Public POCs for CVE-2026-40561
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IV. Related Vulnerabilities
Same weakness: CWE-444
- CVE-2026-40562
Gazelle versions through 0.49 for Perl allows HTTP Request S - CVE-2026-39805
CL.CL HTTP request smuggling via duplicate Content-Length in - CVE-2026-40560
Starman versions before 0.4018 for Perl allows HTTP Request - CVE-2026-41873
Pony Mail: Admin account takeover via request smuggling - CVE-2026-2708
Libsoup: libsoup: http request smuggling via duplicate conte
V. Comments for CVE-2026-40561
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