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Vulnerability record · CVE-2026-40560 · published 29 April 2026

CVE-2026-40560: Miyagawa starman http request smuggling vulnerability

Miyagawa · Starman

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.

7.5 CVSS 3.1 High EPSS 0.54% · top 56.9% CWE-444 · HTTP request smuggling
7.5CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch PatchThird Party Advisory
https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes ProductRelease Notes
http://www.openwall.com/lists/oss-security/2026/04/29/1 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-40560), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.