CVE-2026-40561
Medium
Description
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starlet 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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Kazuho Starlet
PublishedMay 3, 2026
First seenMay 3, 2026
Weakness typeCWE-444CWE-444
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kazuho starlet | v ≤ 0.31 | — |
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