CVE-2026-40560

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-40560
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 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch Patch Third Party Advisory
https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes Product Release Notes
http://www.openwall.com/lists/oss-security/2026/04/29/1 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:miyagawa:starman:*:*:*:*:*:perl:*:*
History

06 May 2026, 16:35

Type Values Removed Values Added
References () https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 - () https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 - Third Party Advisory
References () https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch - () https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch - Patch, Third Party Advisory
References () https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes - () https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes - Product, Release Notes
References () http://www.openwall.com/lists/oss-security/2026/04/29/1 - () http://www.openwall.com/lists/oss-security/2026/04/29/1 - Mailing List, Third Party Advisory
First Time Miyagawa
Miyagawa starman
CPE cpe:2.3:a:miyagawa:starman:*:*:*:*:*:perl:*:*

30 Apr 2026, 15:13

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/04/29/1 -
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5

29 Apr 2026, 00:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-29 00:16

Updated : 2026-05-06 16:35

NVD link : CVE-2026-40560

Mitre link : CVE-2026-40560

CVE.ORG link : CVE-2026-40560

JSON object : View

Products Affected

miyagawa

  • starman
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')