QwikSec

Security Database

CVE

CWE

Training

CVE-2026-40561

Published: May 3, 2026

Modified: May 7, 2026

PUBLISHED

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.

Vendor	Product	Versions
KAZUHO	Starlet	affected `0 - <= 0.31`

Weaknesses (CWE)

References

https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3

https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch

patch

https://metacpan.org/release/KAZUHO/Starlet-0.32/changes

release-notes

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.