High severity7.5NVD Advisory· Published Apr 29, 2026· Updated May 6, 2026
CVE-2026-40560
CVE-2026-40560
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.
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Affected products
4Patches
Vulnerability mechanics
References
4- github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patchnvdPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2026/04/29/1nvdMailing ListThird Party Advisory
- datatracker.ietf.org/doc/html/rfc7230nvdThird Party Advisory
- metacpan.org/release/MIYAGAWA/Starman-0.4018/changesnvdProductRelease Notes
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