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CVE-2026-40562

Published: May 6, 2026

Modified: May 7, 2026

PUBLISHED

Description

Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Gazelle 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
KAZEBURO	Gazelle	affected `0 - <= 0.49`

Weaknesses (CWE)

References

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

https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch

patch

https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes

release-notes

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