High 7.5Published Apr 29, 2026

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

Updated under an hour ago (2026-10-19 09:00 UTC)

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

miyagawa starman miyagawa:starman	before 0.4018	NVD

References

https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3third-party-advisory
https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patchpatch, third-party-advisory
https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changesproduct, release-notes
http://www.openwall.com/lists/oss-security/2026/04/29/1mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.