# CVE-2026-40560

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40560
- **Published:** 2026-04-29
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-444

## Affected products

- `miyagawa:starman`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40560

## Citation

> AI Analytics. CVE-2026-40560. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-40560. Derived from NIST NVD. Licensed CC0.

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