CVE-2026-40560
Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
5th
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.
| CWE | CWE-444 |
| Vendor | miyagawa |
| Product | starman |
| Published | Apr 28, 2026 |
| Last Updated | Apr 29, 2026 |
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Affected Versions
MIYAGAWA / Starman
0 < 0.4018
References
github.com: https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch metacpan.org: https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes datatracker.ietf.org: https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/29/1
Credits
CPANSec