High severity7.5NVD Advisory· Published May 6, 2026· Updated May 11, 2026
CVE-2026-40562
CVE-2026-40562
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.
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Affected products
2- Range: <=0.49
Patches
Vulnerability mechanics
References
4- security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patchnvdPatch
- www.openwall.com/lists/oss-security/2026/05/06/7nvdMailing ListThird Party Advisory
- datatracker.ietf.org/doc/html/rfc7230nvdThird Party Advisory
- metacpan.org/release/KAZEBURO/Gazelle-0.50/changesnvdRelease Notes
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