CVE-2026-40560
HIGHStarman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence
Title source: cnaDescription
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.
References (4)
Scores
CVSS v3
7.5
EPSS
0.0003
EPSS Percentile
8.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-444
Status
published
Products (1)
MIYAGAWA/Starman
< 0.4018
Published
Apr 29, 2026
Tracked Since
Apr 29, 2026