VULNERABILITY INTELLIGENCE

CVE-2026-40562

CVSS score7.5 HIGH
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-05-06
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Weakness classification

  • 9b29abf9-4ab0-4765-b253-1875cd9b441e: CWE-444

Primary references