CVE-2026-40560CWE-444

Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence

High · published April 28, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
44.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00539 · 44.6th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-04-28T23:46Z
EPSS history
Timeline
  • 28 APR 23:46Z
    Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence
    cvelistv5